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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JSON

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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 CNA under the mitre root

CNA scorecard E 28/100 over 2325 records in the last 180 days details

References

3 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

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{
  "containers": {
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T04:03:08.340Z",
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        "references": [
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            "url": "https://github.com/nvzqz/fruity/issues/14"
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            "url": "https://rustsec.org/advisories/RUSTSEC-2021-0123.html"
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        ],
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    "cna": {
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        }
      ],
      "problemTypes": [
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          "url": "https://github.com/nvzqz/fruity/issues/14"
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          "url": "https://github.com/rustsec/advisory-db/pull/1102"
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          "url": "https://rustsec.org/advisories/RUSTSEC-2021-0123.html"
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            }
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RUSTSEC-2021-0123 (CVE-2021-43620)

Vulnerability from osv_rustsec – Published: 2021-11-14 12:00 – Updated: 2023-06-13 13:10 – Source website

Summary

Converting `NSString` to a String Truncates at Null Bytes

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.

Impact

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.

Example:

let string = NSString::from_str("null\0byte");
println!("{}", string);

That example only prints the string "null".

References

URL

Type

	https://crates.io/crates/fruity	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2021-0123.html	ADVISORY
	https://github.com/nvzqz/fruity/issues/14	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "fruity::foundation::NSString::to_str",
            "fruity::foundation::NSString::to_str_with_nul",
            "fruity::foundation::NSString::to_string",
            "fruity::foundation::NSString::to_string_with_nul"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "fruity",
        "purl": "pkg:cargo/fruity"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.3.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-43620",
    "GHSA-h352-g5vw-3926"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Methods of [`NSString`] for conversion to a string may return a partial result.\nSince they call [`CStr::from_ptr`] on a pointer to the string buffer, the\nstring is terminated at the first null byte, which might not be the end of the\nstring.\n\nIn addition to the vulnerable functions listed for this issue, the\nimplementations of [`Display`], [`PartialEq`], [`PartialOrd`], and [`ToString`]\nfor [`NSString`] are also affected, since they call those functions.\n\n## Impact\n\nSince [`NSString`] is commonly used as the type for paths by the [Foundation]\nframework, null byte truncation might allow for easily bypassing file extension\nchecks. For example, if a file name is provided by a user and validated to have\none of a specific set of extensions, with validation taking place before\ntruncation, an attacker can add an accepted extension after a null byte (e.g.,\n`file.exe\\0.txt`). After truncation, the file name used by the application\nwould be `file.exe`.\n\nIt would be better to generate unique names for files, instead of using\nuser-provided names, but not all applications take this approach.\n\n## Example:\n\n```rust\nlet string = NSString::from_str(\"null\\0byte\");\nprintln!(\"{}\", string);\n```\n\nThat example only prints the string \"null\".\n\n[`CStr::from_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_ptr\n[`Display`]: https://doc.rust-lang.org/std/fmt/trait.Display.html\n[Foundation]: https://developer.apple.com/documentation/foundation\n[`NSString`]: https://docs.rs/fruity/0.2.0/fruity/foundation/struct.NSString.html\n[`PartialEq`]: https://doc.rust-lang.org/std/cmp/trait.PartialEq.html\n[`PartialOrd`]: https://doc.rust-lang.org/std/cmp/trait.PartialOrd.html\n[`ToString`]: https://doc.rust-lang.org/std/string/trait.ToString.html",
  "id": "RUSTSEC-2021-0123",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2021-11-14T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/fruity"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0123.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nvzqz/fruity/issues/14"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Converting `NSString` to a String Truncates at Null Bytes"
}

Sightings

Author	Source	Type	Date	Other

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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

GHSA-H352-G5VW-3926

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

RUSTSEC-2021-0123 (CVE-2021-43620)

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