Vulnerability-Lookup

GHSA-H352-G5VW-3926

Vulnerability from github – Published: 2021-11-16 17:26 – Updated: 2023-06-13 17:27

Summary

Improper Input Validation in fruity

Details

Methods of NSString for conversion to a string may return a partial result. Since they call CStr::from_ptr on a pointer to the string buffer, the string is terminated at the first null byte, which might not be the end of the string.

In addition to the vulnerable functions listed for this issue, the implementations of Display, PartialEq, PartialOrd, and ToString for NSString are also affected, since they call those functions.

Since NSString is commonly used as the type for paths by the Foundation framework, null byte truncation might allow for easily bypassing file extension checks. For example, if a file name is provided by a user and validated to have one of a specific set of extensions, with validation taking place before truncation, an attacker can add an accepted extension after a null byte (e.g., file.exe\0.txt). After truncation, the file name used by the application would be file.exe.

It would be better to generate unique names for files, instead of using user-provided names, but not all applications take this approach.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "fruity"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-43620"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-11-16T15:32:42Z",
    "nvd_published_at": "2021-11-15T05:15:00Z",
    "severity": "HIGH"
  },
  "details": "Methods of NSString for conversion to a string may return a partial result. Since they call CStr::from_ptr on a pointer to the string buffer, the string is terminated at the first null byte, which might not be the end of the string.\n\nIn addition to the vulnerable functions listed for this issue, the implementations of Display, PartialEq, PartialOrd, and ToString for NSString are also affected, since they call those functions.\n\nSince NSString is commonly used as the type for paths by the Foundation framework, null byte truncation might allow for easily bypassing file extension checks. For example, if a file name is provided by a user and validated to have one of a specific set of extensions, with validation taking place before truncation, an attacker can add an accepted extension after a null byte (e.g., file.exe\\0.txt). After truncation, the file name used by the application would be file.exe.\n\nIt would be better to generate unique names for files, instead of using user-provided names, but not all applications take this approach.",
  "id": "GHSA-h352-g5vw-3926",
  "modified": "2023-06-13T17:27:02Z",
  "published": "2021-11-16T17:26:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-43620"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nvzqz/fruity/issues/14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rustsec/advisory-db/pull/1102"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nvzqz/fruity"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0123.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Improper Input Validation in fruity"
}

CVE-2021-43620 (GCVE-0-2021-43620)

Vulnerability from cvelistv5 – Published: 2021-11-15 04:16 – Updated: 2024-08-04 04:03

Summary

An issue was discovered in the fruity crate through 0.2.0 for Rust. Security-relevant validation of filename extensions is plausibly affected. Methods of NSString for conversion to a string may return a partial result. Because they call CStr::from_ptr on a pointer to the string buffer, the string is terminated at the first '\0' byte, which might not be the end of the string.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://github.com/nvzqz/fruity/issues/14	x_refsource_MISC
	https://github.com/rustsec/advisory-db/pull/1102	x_refsource_MISC
	https://rustsec.org/advisories/RUSTSEC-2021-0123.html	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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        }
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-H352-G5VW-3926

CVE-2021-43620 (GCVE-0-2021-43620)

Tags

Sightings

Nomenclature