Common Weakness Enumeration

CWE-434

Weakness Allowed

Unrestricted Upload of File with Dangerous Type

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Mapping guidance

This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.

Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Relationships and members
ChildOf: CWE-669 · View CWE-1000
ChildOf: CWE-669 · View CWE-1003
PeerOf: CWE-351 (symmetric) · View CWE-1000
PeerOf: CWE-436 (symmetric) · View CWE-1000
PeerOf: CWE-430 (symmetric) · View CWE-1000
Modes of introduction
Implementation
Architecture and Design

OMISSION: This weakness is caused by missing a security tactic during the architecture and design phase.

Detection methods

Dynamic Analysis with Automated Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Web Application Scanner

Web Services Scanner

Database Scanners

Effectiveness: SOAR Partial

Dynamic Analysis with Manual Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Fuzz Tester

Framework-based Fuzzer

Effectiveness: SOAR Partial

Manual Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Focused Manual Spotcheck - Focused manual analysis of source

Manual Source Code Review (not inspections)

Effectiveness: High

Automated Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Source code Weakness Analyzer

Context-configured Source Code Weakness Analyzer

Effectiveness: High

Architecture or Design Review

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Formal Methods / Correct-By-Construction

Cost effective for partial coverage:

Inspection (IEEE 1028 standard) (can apply to requirements, design, source code, etc.)

Effectiveness: High

Notes

Relationship

This can have a chaining relationship with incomplete denylist / permissive allowlist errors when the product tries, but fails, to properly limit which types of files are allowed (CWE-183, CWE-184).

This can also overlap multiple interpretation errors for intermediaries, e.g. anti-virus products that do not remove or quarantine attachments with certain file extensions that can be processed by client systems.

Content history
Submission: PLOVER · 2006-07-19 · CWE Draft 3
Contribution: Abhi Balakrishnan · 2024-02-29 · CWE 4.15

Provided diagram to improve CWE usability

Modification: Eric Dalci · Cigital · 2008-07-01 · CWE 1.0

updated Time_of_Introduction

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Alternate_Terms, Relationships, Other_Notes, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2009-01-12 · CWE 1.2

updated Relationships

Modification: CWE Content Team · MITRE · 2009-12-28 · CWE 1.7

updated Applicable_Platforms, Functional_Areas, Likelihood_of_Exploit, Potential_Mitigations, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2010-02-16 · CWE 1.8

converted from Compound_Element to Weakness

Modification: CWE Content Team · MITRE · 2010-02-16 · CWE 1.8

updated Alternate_Terms, Applicable_Platforms, Common_Consequences, Demonstrative_Examples, Name, Other_Notes, Potential_Mitigations, References, Related_Attack_Patterns, Relationship_Notes, Relationships, Type, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2010-04-05 · CWE 1.8.1

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2010-06-21 · CWE 1.9

updated References, Relationship_Notes

Modification: CWE Content Team · MITRE · 2010-09-27 · CWE 1.10

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2010-12-13 · CWE 1.11

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2011-06-27 · CWE 2.0

updated Relationships

Modification: CWE Content Team · MITRE · 2011-09-13 · CWE 2.1

updated Potential_Mitigations, References, Relationships

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated References, Relationships

Modification: CWE Content Team · MITRE · 2012-10-30 · CWE 2.3

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Detection_Factors

Modification: CWE Content Team · MITRE · 2015-12-07 · CWE 2.9

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Affected_Resources, Applicable_Platforms, Likelihood_of_Exploit, Modes_of_Introduction, References, Relationships, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2019-01-03 · CWE 3.2

updated References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2019-06-20 · CWE 3.3

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2019-09-19 · CWE 3.4

updated Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Applicable_Platforms, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2020-06-25 · CWE 4.1

updated Potential_Mitigations, Relationship_Notes

Modification: CWE Content Team · MITRE · 2020-08-20 · CWE 4.2

updated Relationships

Modification: CWE Content Team · MITRE · 2020-12-10 · CWE 4.3

updated Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2021-07-20 · CWE 4.5

updated Relationships

Modification: CWE Content Team · MITRE · 2021-10-28 · CWE 4.6

updated Relationships

Modification: CWE Content Team · MITRE · 2022-04-28 · CWE 4.7

updated Research_Gaps

Modification: CWE Content Team · MITRE · 2022-06-28 · CWE 4.8

updated Relationships

Modification: CWE Content Team · MITRE · 2022-10-13 · CWE 4.9

updated References

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Alternate_Terms, Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated References, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes, Relationships

Modification: CWE Content Team · MITRE · 2024-02-29 · CWE 4.14

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2024-07-16 · CWE 4.15

updated Common_Consequences, Description, Diagram, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2024-11-19 · CWE 4.16

updated Relationships

Modification: CWE Content Team · MITRE · 2025-09-09 · CWE 4.18

updated Detection_Factors, References

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Relationships

Modification: CWE Content Team · MITRE · 2026-04-30 · CWE 4.20

updated Applicable_Platforms, Relationships

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Observed_Examples, References

6654 vulnerabilities reference this CWE, most recent first.

CVE-2026-16332 (GCVE-0-2026-16332)

Vulnerability from cvelistv5 – Published: 2026-07-21 01:30 – Updated: 2026-07-23 14:32
VLAI
Title
D-Link DNS-320 multi_uploadify.php unrestricted upload
Summary
A vulnerability was detected in D-Link DNS-320 1.0.2. This impacts an unknown function of the file /mydlink/multi_uploadify.php. Performing a manipulation of the argument Filedata[] results in unrestricted upload. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 14:32 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
Impacted products
Vendor Product Version
D-Link DNS-320 Affected: 1.0.2
    cpe:2.3:h:d-link:dns-320:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
red88-debug (VulDB User)
Show details on NVD website
To clipboard 

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CVE-2026-16331 (GCVE-0-2026-16331)

Vulnerability from cvelistv5 – Published: 2026-07-21 00:45 – Updated: 2026-07-22 14:15
VLAI
Title
D-Link DNS-320 save_ajax.php unrestricted upload
Summary
A security vulnerability has been detected in D-Link DNS-320 1.0.2. This affects an unknown function of the file /web/function/save_ajax.php. Such manipulation of the argument Malicious Handler leads to unrestricted upload. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 14:15 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
Impacted products
Vendor Product Version
D-Link DNS-320 Affected: 1.0.2
    cpe:2.3:h:d-link:dns-320:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
red88-debug (VulDB User)
Show details on NVD website
To clipboard 

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CVE-2026-16330 (GCVE-0-2026-16330)

Vulnerability from cvelistv5 – Published: 2026-07-21 00:30 – Updated: 2026-07-21 14:55
VLAI
Title
D-Link DNS-320 uploadify.php unrestricted upload
Summary
A weakness has been identified in D-Link DNS-320 1.0.2. The impacted element is an unknown function of the file /web/jquery/uploader/uploadify.php. This manipulation of the argument https:/ucn9h68n9289.feishu.cn/wiki/JJcTwHz7aiKeq6kSItMcoeSUnMc?from=from_copylink causes unrestricted upload. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 13:12 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
Impacted products
Vendor Product Version
D-Link DNS-320 Affected: 1.0.2
    cpe:2.3:h:d-link:dns-320:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
red88-debug (VulDB User)
Show details on NVD website
To clipboard 

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CVE-2026-16329 (GCVE-0-2026-16329)

Vulnerability from cvelistv5 – Published: 2026-07-21 00:15 – Updated: 2026-07-22 13:58
VLAI
Title
D-Link DNS-320 uploadify.php unrestricted upload
Summary
A vulnerability was identified in D-Link DNS-320 1.0.2. Impacted is an unknown function of the file /photo_center/php/uploadify.php. The manipulation of the argument Malicious Handler leads to unrestricted upload. The attack may be initiated remotely. The exploit is publicly available and might be used.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 13:58 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
Impacted products
Vendor Product Version
D-Link DNS-320 Affected: 1.0.2
    cpe:2.3:h:d-link:dns-320:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
red88-debug (VulDB User)
Show details on NVD website
To clipboard 

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CVE-2026-16327 (GCVE-0-2026-16327)

Vulnerability from cvelistv5 – Published: 2026-07-20 23:45 – Updated: 2026-07-21 13:07
VLAI
Title
D-Link DNS-320 upload.php unrestricted upload
Summary
A vulnerability was determined in D-Link DNS-320 1.0.2. This issue affects some unknown processing of the file /web/web_file/upload.php. Executing a manipulation of the argument File can lead to unrestricted upload. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 13:06 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
Impacted products
Vendor Product Version
D-Link DNS-320 Affected: 1.0.2
    cpe:2.3:h:d-link:dns-320:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
bigbrother_man (VulDB User)
Show details on NVD website
To clipboard 

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CVE-2026-16324 (GCVE-0-2026-16324)

Vulnerability from cvelistv5 – Published: 2026-07-20 21:45 – Updated: 2026-07-22 14:37
VLAI
Title
Metasoft 美特软件 MetaCRM upload.jsp unrestricted upload
Summary
A vulnerability was identified in Metasoft 美特软件 MetaCRM up to 6.4.0 Beta06. The impacted element is an unknown function of the file /business/qnaire/upload.jsp. Such manipulation of the argument File leads to unrestricted upload. The attack may be launched remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.3 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 14:36 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
URL Tags
https://vuldb.com/vuln/380685 vdb-entrytechnical-description
https://vuldb.com/vuln/380685/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16324 third-party-advisory
https://vuldb.com/submit/858454 third-party-advisory
https://ucn9h68n9289.feishu.cn/docx/RTF0d4zxooIMA… exploit
Impacted products
Vendor Product Version
Metasoft 美特软件 MetaCRM Affected: 6.4.0 Beta06
    cpe:2.3:a:metasoft_:metacrm:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
bigbrother_man (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

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CVE-2026-16286 (GCVE-0-2026-16286)

Vulnerability from cvelistv5 – Published: 2026-08-25 14:26 – Updated: 2026-08-25 14:51
VLAI
Title
File Upload in TRTEK Software's Software Repository Management
Summary
Unrestricted upload of file with dangerous type vulnerability in TRtek Technological Products Computer Software Hardware Industry and Trade Limited Company Software Repository Management allows Upload a Web Shell to a Web Server. This issue affects Software Repository Management: before 2fb4acee.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:38 UTC
CWE
  • CWE-434 - Unrestricted upload of file with dangerous type
Assigner
TR-CERT CNA under the mitre root
CNA scorecard C 74/100 over 279 records in the last 180 days details
References
Impacted products
Date Public
2026-08-25 14:19
Credits
Muhammet Talha ODABASI Yunus KARA Abdurrahman Emre OZKOK
Show details on NVD website
To clipboard 

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CVE-2026-16236 (GCVE-0-2026-16236)

Vulnerability from cvelistv5 – Published: 2026-07-31 05:35 – Updated: 2026-07-31 15:58
VLAI
Title
Realtyna Organic IDX plugin + WPL Real Estate <= 5.3.0 - Authenticated (Subscriber+) Arbitrary File Upload
Summary
The Realtyna Organic IDX plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 5.3.0. This is due to missing file extension and content validation in the saveLiveImages() function combined with an insufficient authorization check on the get_keys() AJAX handler and a missing authentication check on the REST API import endpoint. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 15:55 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2451 records in the last 180 days details
References
Impacted products
Credits
Son Van (mrs0x06)
Show details on NVD website
To clipboard 

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CVE-2026-16226 (GCVE-0-2026-16226)

Vulnerability from cvelistv5 – Published: 2026-07-19 08:15 – Updated: 2026-07-20 13:20 X_Freeware
VLAI
Title
SourceCodester Pizzafy Ecommerce System admin_class_novo.php save_settings unrestricted upload
Summary
A weakness has been identified in SourceCodester Pizzafy Ecommerce System 1.0. This affects the function save_settings of the file /admin/admin_class_novo.php. This manipulation of the argument img causes unrestricted upload. The attack is possible to be carried out remotely.
Severity
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
4.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
4.7 (Medium)
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:20 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3850 records in the last 180 days details
References
URL Tags
https://vuldb.com/vuln/380048 vdb-entrytechnical-description
https://vuldb.com/vuln/380048/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16226 third-party-advisory
https://vuldb.com/submit/858229 third-party-advisory
https://www.sourcecodester.com/ product
Impacted products
Vendor Product Version
SourceCodester Pizzafy Ecommerce System Affected: 1.0
    cpe:2.3:a:sourcecodester:pizzafy_ecommerce_system:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
q1w2e3r4t5y6 (VulDB User) VulDB Vulnerability Moderation Team
Show details on NVD website
To clipboard 

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CVE-2026-16137 (GCVE-0-2026-16137)

Vulnerability from cvelistv5 – Published: 2026-08-17 13:32 – Updated: 2026-08-18 03:55
VLAI
Title
Path traversal via unsanitized upload filename leads to arbitrary file write in Progress ShareFile Storage Zones Controller
Summary
In Progress ShareFile Storage Zones Controller v5.12.5 and below, a party with valid zone credentials can perform path traversal using resumable upload initiation endpoint, allowing the party to write arbitrary content to any location writable by the application's service account. This may result in the execution of attacker-supplied code.
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 00:00 UTC
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-73 - External Control of File Name or Path
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
ProgressSoftware CNA under the mitre root
CNA scorecard B 79/100 over 207 records in the last 180 days details
References
Impacted products
Vendor Product Version
Progress ShareFile Storage Zones Controller Affected: 0 , ≤ 5.12.5 (semver)
Create a notification for this product.
Credits
Piotr Bazydlo (@chudyPB) of watchTowr
Show details on NVD website
To clipboard 

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Mitigation
Architecture and Design

Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.[REF-422] [REF-423]

Mitigation MIT-21
Architecture and Design

Strategy: Enforcement by Conversion

When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.

Mitigation
Architecture and Design

Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically. [REF-423]

Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • For example, limiting filenames to alphanumeric characters can help to restrict the introduction of unintended file extensions.
Mitigation
Architecture and Design

Define a very limited set of allowable extensions and only generate filenames that end in these extensions. Consider the possibility of XSS (CWE-79) before allowing .html or .htm file types.

Mitigation
Implementation

Strategy: Input Validation

Ensure that only one extension is used in the filename. Some web servers, including some versions of Apache, may process files based on inner extensions so that "filename.php.gif" is fed to the PHP interpreter.[REF-422] [REF-423]

Mitigation
Implementation

When running on a web server that supports case-insensitive filenames, perform case-insensitive evaluations of the extensions that are provided.

Mitigation MIT-15
Architecture and Design

For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

Mitigation
Implementation

Do not rely exclusively on sanity checks of file contents to ensure that the file is of the expected type and size. It may be possible for an attacker to hide code in some file segments that will still be executed by the server. For example, GIF images may contain a free-form comments field.

Mitigation
Implementation

Do not rely exclusively on the MIME content type or filename attribute when determining how to render a file. Validating the MIME content type and ensuring that it matches the extension is only a partial solution.

Mitigation MIT-17
Architecture and Design Operation

Strategy: Environment Hardening

Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

Mitigation MIT-22
Architecture and Design Operation

Strategy: Sandbox or Jail

  • Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.
CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs

In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.

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