CWE-23
AllowedRelative Path Traversal
Abstraction: Base · Status: Draft
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
931 vulnerabilities reference this CWE, most recent first.
GHSA-V6QH-PM8G-3C5W
Vulnerability from github – Published: 2026-07-07 12:31 – Updated: 2026-09-03 15:32A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root. On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass.
{
"affected": [],
"aliases": [
"CVE-2026-14476"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-07T10:16:39Z",
"severity": "HIGH"
},
"details": "A path traversal flaw was found in SSSD\u0027s AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root. On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass.",
"id": "GHSA-v6qh-pm8g-3c5w",
"modified": "2026-09-03T15:32:00Z",
"published": "2026-07-07T12:31:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14476"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496581"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-14476"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:60019"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:59831"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:57483"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:56911"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:56853"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:56786"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:54769"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:54599"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:54581"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:54553"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:54187"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:50109"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49844"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49843"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49842"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49841"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49840"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49839"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:46990"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:46482"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:42122"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:41937"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-V78G-P78J-5486
Vulnerability from github – Published: 2023-09-11 21:30 – Updated: 2023-09-11 21:30Relative Path Traversal in GitHub repository mintplex-labs/anything-llm prior to 0.0.1.
{
"affected": [],
"aliases": [
"CVE-2023-4897"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-09-11T21:15:42Z",
"severity": "HIGH"
},
"details": "Relative Path Traversal in GitHub repository mintplex-labs/anything-llm prior to 0.0.1.",
"id": "GHSA-v78g-p78j-5486",
"modified": "2023-09-11T21:30:17Z",
"published": "2023-09-11T21:30:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4897"
},
{
"type": "WEB",
"url": "https://github.com/mintplex-labs/anything-llm/commit/3c88aec034934bcbad30c5ef1cab62cbbdb98e64"
},
{
"type": "WEB",
"url": "https://huntr.dev/bounties/0631af48-84a3-4019-85db-f0f8b12cb0ab"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-V96G-9H62-76PJ
Vulnerability from github – Published: 2023-01-20 09:30 – Updated: 2023-02-01 03:30A vulnerability in the NETCONF service of Cisco Network Services Orchestrator (NSO) could allow an authenticated, remote attacker to cause a denial of service (DoS) on an affected system that is running as the root user. To exploit this vulnerability, the attacker must be a member of the admin group. This vulnerability exists because user-supplied input is not properly validated when NETCONF is used to upload packages to an affected device. An attacker could exploit this vulnerability by uploading a specially crafted package file. A successful exploit could allow the attacker to write crafted files to arbitrary locations on the filesystem or delete arbitrary files from the filesystem of an affected device, resulting in a DoS condition. Note: By default, during install, Cisco NSO will be set up to run as the root user unless the --run-as-user option is used.
{
"affected": [],
"aliases": [
"CVE-2023-20040"
],
"database_specific": {
"cwe_ids": [
"CWE-23",
"CWE-434"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-01-20T07:15:00Z",
"severity": "MODERATE"
},
"details": "A vulnerability in the NETCONF service of Cisco Network Services Orchestrator (NSO) could allow an authenticated, remote attacker to cause a denial of service (DoS) on an affected system that is running as the root user. To exploit this vulnerability, the attacker must be a member of the admin group. This vulnerability exists because user-supplied input is not properly validated when NETCONF is used to upload packages to an affected device. An attacker could exploit this vulnerability by uploading a specially crafted package file. A successful exploit could allow the attacker to write crafted files to arbitrary locations on the filesystem or delete arbitrary files from the filesystem of an affected device, resulting in a DoS condition. Note: By default, during install, Cisco NSO will be set up to run as the root user unless the --run-as-user option is used.",
"id": "GHSA-v96g-9h62-76pj",
"modified": "2023-02-01T03:30:28Z",
"published": "2023-01-20T09:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-20040"
},
{
"type": "WEB",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-path-trvsl-zjBeMkZg"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-VGM7-9PJC-5GCF
Vulnerability from github – Published: 2026-08-11 21:33 – Updated: 2026-08-11 21:33The Formidable Digital Signatures plugin for WordPress is vulnerable to file deletion due to insufficient file path validation in the delete_file function in all versions up to, and including, 3.0.6. This makes it possible for unauthenticated attackers to delete files on the server by supplying an attacker-controlled filename in the item_meta[field_id][content] parameter alongside the delete_saved_image flag during the standard entry-creation POST flow on any form that accepts anonymous submissions.
{
"affected": [],
"aliases": [
"CVE-2026-16230"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-11T20:17:27Z",
"severity": "CRITICAL"
},
"details": "The Formidable Digital Signatures plugin for WordPress is vulnerable to file deletion due to insufficient file path validation in the delete_file function in all versions up to, and including, 3.0.6. This makes it possible for unauthenticated attackers to delete files on the server by supplying an attacker-controlled filename in the item_meta[field_id][content] parameter alongside the delete_saved_image flag during the standard entry-creation POST flow on any form that accepts anonymous submissions.",
"id": "GHSA-vgm7-9pjc-5gcf",
"modified": "2026-08-11T21:33:09Z",
"published": "2026-08-11T21:33:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16230"
},
{
"type": "WEB",
"url": "https://formidableforms.com"
},
{
"type": "WEB",
"url": "https://formidableforms.com/changelog/digital-signature-forms-3-1"
},
{
"type": "WEB",
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/c9a5f8ca-7efc-401b-8a93-07fbe7204dce?source=cve"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-VGX7-38J2-7693
Vulnerability from github – Published: 2026-10-13 21:33 – Updated: 2026-10-13 21:33Relative path traversal in Windows Libarchive allows an unauthorized attacker to perform tampering over a network.
{
"affected": [],
"aliases": [
"CVE-2026-69968"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-13T19:19:07Z",
"severity": "MODERATE"
},
"details": "Relative path traversal in Windows Libarchive allows an unauthorized attacker to perform tampering over a network.",
"id": "GHSA-vgx7-38j2-7693",
"modified": "2026-10-13T21:33:56Z",
"published": "2026-10-13T21:33:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-69968"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69968"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-VJP4-M83C-MP26
Vulnerability from github – Published: 2026-09-07 09:31 – Updated: 2026-09-08 18:31The ftp and scp tasks of Apache Ant can download files from a remote server. A malicious server can provide relative paths that allow it to write outside of the dedicated target directory for the download, making it possible to overwrite files of the attacker's choice using the permissions of the user running Ant in versions prior to Ant 1.10.18.
In order to exploit this vulnerability, the server would either have to be malicious or be subject to a machine-in-the-middle attack. Additionally in the case of scp or the ftp task using ftps the server must pass the server identity checks performed by the tasks.
For ftp tasks not using ftps a malicious server could act as a machine-in-the-middle to provide malicious files.
Starting with Ant 1.10.18 both tasks will prevent writing outside of the destination directory by default. An option is available to disable this behavior in the unlikely case that the old behavior is required by existing build files.
Mitigations:
Users of scp and ftp (when using ftps) in any version of Ant should not bypass server identity checks. Users of ftp not using ftps should switch to ftps where possible.
All users are recommended to upgrade to Apache Ant 1.10.18, which fixes this issue.
{
"affected": [],
"aliases": [
"CVE-2026-78254"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-07T08:17:12Z",
"severity": "HIGH"
},
"details": "The ftp and scp tasks of Apache Ant can download files from a remote server. A malicious server can provide relative paths that allow it to write outside of the dedicated target directory for the download, making it possible to overwrite files of the attacker\u0027s choice using the permissions of the user running Ant in versions prior to Ant 1.10.18. \n\n\n\n\nIn order to exploit this vulnerability, the server would either have to be malicious\u00a0or be subject to a machine-in-the-middle attack. Additionally\u00a0in the case of scp or the ftp task using ftps the server must pass the server identity checks performed by the tasks.\n\n\n\n\nFor ftp tasks not using ftps a malicious server could act as a machine-in-the-middle to provide malicious files.\n\n\n\n\nStarting with Ant 1.10.18 both tasks will prevent writing outside of the destination directory by default. An option is available to disable this behavior in the unlikely case that the old behavior is required by existing build files.\n\n\n\n\nMitigations:\n\n\n\n\nUsers of scp and ftp (when using ftps) in any version of Ant should not bypass server identity checks. Users of ftp not using ftps should switch to ftps where possible.\n\n\n\n\nAll users are recommended to upgrade to Apache Ant 1.10.18, which fixes this issue.",
"id": "GHSA-vjp4-m83c-mp26",
"modified": "2026-09-08T18:31:45Z",
"published": "2026-09-07T09:31:39Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78254"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread/05s46qrlbhd06c6rsgvxh8zo0l4p9scz"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/09/06/2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-VJW7-6GFQ-6WF5
Vulnerability from github – Published: 2022-02-10 20:28 – Updated: 2021-04-22 22:08In Eclipse Vert.x 3.4.x up to 3.9.4, 4.0.0-milestone1, 4.0.0-milestone2, 4.0.0-milestone3, 4.0.0-milestone4, 4.0.0-milestone5, 4.0.0.Beta1, 4.0.0.Beta2, and 4.0.0.Beta3, StaticHandler doesn't correctly processes back slashes on Windows Operating systems, allowing, escape the webroot folder to the current working directory.
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "io.vertx:vertx-web"
},
"ranges": [
{
"events": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.9.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2019-17640"
],
"database_specific": {
"cwe_ids": [
"CWE-22",
"CWE-23"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-22T22:08:15Z",
"nvd_published_at": "2020-10-15T21:15:00Z",
"severity": "CRITICAL"
},
"details": "In Eclipse Vert.x 3.4.x up to 3.9.4, 4.0.0-milestone1, 4.0.0-milestone2, 4.0.0-milestone3, 4.0.0-milestone4, 4.0.0-milestone5, 4.0.0.Beta1, 4.0.0.Beta2, and 4.0.0.Beta3, StaticHandler doesn\u0027t correctly processes back slashes on Windows Operating systems, allowing, escape the webroot folder to the current working directory.",
"id": "GHSA-vjw7-6gfq-6wf5",
"modified": "2021-04-22T22:08:15Z",
"published": "2022-02-10T20:28:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-17640"
},
{
"type": "WEB",
"url": "https://github.com/vert-x3/vertx-web/commit/b12f7c4c6576a8adc3f683b2899de4b0e7d099e4"
},
{
"type": "WEB",
"url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=567416"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r591f6932560c8c46cee87415afed92924a982189fea7f7c9096f8e33@%3Ccommits.pulsar.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r8383b5e7344a8b872e430ad72241b84b83e9701d275c602cfe34a941@%3Ccommits.servicecomb.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r8d863b148efe778ce5f8f961d0cafeda399e681d3f0656233b4c5511@%3Ccommits.pulsar.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26@%3Ccommits.pulsar.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rfd0ebf8387cfd0b959d1e218797e709793cce51a5ea2f84d0976f47d@%3Ccommits.pulsar.apache.org%3E"
},
{
"type": "WEB",
"url": "https://mvnrepository.com/artifact/io.vertx/vertx-web"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Path Traversal in Eclipse Vert"
}
GHSA-VM7F-687F-4R4G
Vulnerability from github – Published: 2024-01-12 18:30 – Updated: 2024-01-12 18:30NVIDIA Triton Inference Server for Linux and Windows contains a vulnerability where, when it is launched with the non-default command line option --model-control explicit, an attacker may use the model load API to cause a relative path traversal. A successful exploit of this vulnerability may lead to code execution, denial of service, escalation of privileges, information disclosure, and data tampering.
{
"affected": [],
"aliases": [
"CVE-2023-31036"
],
"database_specific": {
"cwe_ids": [
"CWE-22",
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-12T17:15:09Z",
"severity": "HIGH"
},
"details": "NVIDIA Triton Inference Server for Linux and Windows contains a vulnerability where, when it is launched with the non-default command line option --model-control explicit, an attacker may use the model load API to cause a relative path traversal. A successful exploit of this vulnerability may lead to code execution, denial of service, escalation of privileges, information disclosure, and data tampering.",
"id": "GHSA-vm7f-687f-4r4g",
"modified": "2024-01-12T18:30:20Z",
"published": "2024-01-12T18:30:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-31036"
},
{
"type": "WEB",
"url": "https://nvidia.custhelp.com/app/answers/detail/a_id/5509"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-VMMH-QX88-M8X2
Vulnerability from github – Published: 2025-04-01 06:30 – Updated: 2026-04-08 18:33The Import Export Suite for CSV and XML Datafeed plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the deleteImage() function in all versions up to, and including, 7.19. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php).
{
"affected": [],
"aliases": [
"CVE-2025-2007"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-01T05:15:47Z",
"severity": "HIGH"
},
"details": "The Import Export Suite for CSV and XML Datafeed plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the deleteImage() function in all versions up to, and including, 7.19. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php).",
"id": "GHSA-vmmh-qx88-m8x2",
"modified": "2026-04-08T18:33:51Z",
"published": "2025-04-01T06:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-2007"
},
{
"type": "WEB",
"url": "https://plugins.trac.wordpress.org/changeset/3261521/wp-ultimate-csv-importer/trunk/MediaHandling.php"
},
{
"type": "WEB",
"url": "https://plugins.trac.wordpress.org/changeset/3266286"
},
{
"type": "WEB",
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/3923c732-80b5-4a04-80dd-b4d5b5e5567d?source=cve"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-VRF6-3396-G684
Vulnerability from github – Published: 2024-07-10 03:30 – Updated: 2024-07-10 03:30Relative Path Traversal in GitHub repository stitionai/devika prior to -.
{
"affected": [],
"aliases": [
"CVE-2024-6433"
],
"database_specific": {
"cwe_ids": [
"CWE-23"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-10T01:15:10Z",
"severity": "HIGH"
},
"details": "Relative Path Traversal in GitHub repository stitionai/devika prior to -.",
"id": "GHSA-vrf6-3396-g684",
"modified": "2024-07-10T03:30:35Z",
"published": "2024-07-10T03:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6433"
},
{
"type": "WEB",
"url": "https://huntr.com/bounties/7d0463dd-6373-4eb8-86fc-beac0a1391a5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-5.1
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.
- When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
- Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation MIT-20.1
Strategy: Input Validation
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
- Use a built-in path canonicalization function (such as realpath() in C) that produces the canonical version of the pathname, which effectively removes ".." sequences and symbolic links (CWE-23, CWE-59). This includes:
- realpath() in C
- getCanonicalPath() in Java
- GetFullPath() in ASP.NET
- realpath() or abs_path() in Perl
- realpath() in PHP
Mitigation MIT-29
Strategy: Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
CAPEC-139: Relative Path Traversal
An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.