Vulnerability-Lookup

GHSA-76W9-P8MG-J927

Vulnerability from github – Published: 2022-01-06 22:07 – Updated: 2024-02-21 19:15

Summary

Out-of-bounds Write in nix

Details

On certain platforms, if a user has more than 16 groups, the nix::unistd::getgrouplist function will call the libc getgrouplist function with a length parameter greater than the size of the buffer it provides, resulting in an out-of-bounds write and memory corruption.

The libc getgrouplist function takes an in/out parameter ngroups specifying the size of the group buffer. When the buffer is too small to hold all of the requested user's group memberships, some libc implementations, including glibc and Solaris libc, will modify ngroups to indicate the actual number of groups for the user, in addition to returning an error. The version of nix::unistd::getgrouplist in nix 0.16.0 and up will resize the buffer to twice its size, but will not read or modify the ngroups variable. Thus, if the user has more than twice as many groups as the initial buffer size of 8, the next call to getgrouplist will then write past the end of the buffer.

The issue would require editing /etc/groups to exploit, which is usually only editable by the root user.

Severity

6.7 (Medium)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "nix"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.16.0"
            },
            {
              "fixed": "0.20.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "nix"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.21.0"
            },
            {
              "fixed": "0.21.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "nix"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.22.0"
            },
            {
              "fixed": "0.22.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-45707"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-01-05T23:13:23Z",
    "nvd_published_at": "2021-12-27T00:15:00Z",
    "severity": "MODERATE"
  },
  "details": "On certain platforms, if a user has more than 16 groups, the nix::unistd::getgrouplist function will call the libc getgrouplist function with a length parameter greater than the size of the buffer it provides, resulting in an out-of-bounds write and memory corruption.\n\nThe libc getgrouplist function takes an in/out parameter ngroups specifying the size of the group buffer. When the buffer is too small to hold all of the requested user\u0027s group memberships, some libc implementations, including glibc and Solaris libc, will modify ngroups to indicate the actual number of groups for the user, in addition to returning an error. The version of nix::unistd::getgrouplist in nix 0.16.0 and up will resize the buffer to twice its size, but will not read or modify the ngroups variable. Thus, if the user has more than twice as many groups as the initial buffer size of 8, the next call to getgrouplist will then write past the end of the buffer.\n\nThe issue would require editing /etc/groups to exploit, which is usually only editable by the root user.",
  "id": "GHSA-76w9-p8mg-j927",
  "modified": "2024-02-21T19:15:12Z",
  "published": "2022-01-06T22:07:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-45707"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nix-rust/nix/issues/1541"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wgrg-5h56-jg27"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nix-rust/nix"
    },
    {
      "type": "WEB",
      "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/nix/RUSTSEC-2021-0119.md"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0119.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Out-of-bounds Write in nix"
}

CVE-2021-45707 (GCVE-0-2021-45707)

Vulnerability from cvelistv5 – Published: 2021-12-26 21:48 – Updated: 2024-08-04 04:47

Summary

An issue was discovered in the nix crate 0.16.0 and later before 0.20.2, 0.21.x before 0.21.2, and 0.22.x before 0.22.2 for Rust. unistd::getgrouplist has an out-of-bounds write if a user is in more than 16 /etc/groups groups.

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2341 records in the last 180 days details

References

3 references

URL	Tags
https://rustsec.org/advisories/RUSTSEC-2021-0119.html	x_refsource_MISC
https://raw.githubusercontent.com/rustsec/advisor…	x_refsource_MISC
https://github.com/advisories/GHSA-wgrg-5h56-jg27	x_refsource_MISC

Show details on NVD website

JSON

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{
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          "dateUpdated": "2024-08-04T04:47:02.459Z",
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        }
      ],
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RUSTSEC-2021-0119 (CVE-2021-45707)

Vulnerability from osv_rustsec – Published: 2021-09-27 12:00 – Updated: 2023-06-13 13:10 – Source website

Summary

Out-of-bounds write in nix::unistd::getgrouplist

Details

On certain platforms, if a user has more than 16 groups, the nix::unistd::getgrouplist function will call the libc getgrouplist function with a length parameter greater than the size of the buffer it provides, resulting in an out-of-bounds write and memory corruption.

The libc getgrouplist function takes an in/out parameter ngroups specifying the size of the group buffer. When the buffer is too small to hold all of the requested user's group memberships, some libc implementations, including glibc and Solaris libc, will modify ngroups to indicate the actual number of groups for the user, in addition to returning an error. The version of nix::unistd::getgrouplist in nix 0.16.0 and up will resize the buffer to twice its size, but will not read or modify the ngroups variable. Thus, if the user has more than twice as many groups as the initial buffer size of 8, the next call to getgrouplist will then write past the end of the buffer.

The issue would require editing /etc/groups to exploit, which is usually only editable by the root user.

References

URL

Type

	https://crates.io/crates/nix	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2021-0119.html	ADVISORY
	https://github.com/nix-rust/nix/issues/1541	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "nix::unistd::getgrouplist"
          ],
          "os": [
            "linux",
            "freebsd",
            "android",
            "netbsd",
            "dragonfly",
            "openbsd",
            "fuchsia"
          ]
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "nix",
        "purl": "pkg:cargo/nix"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.16.0"
            },
            {
              "fixed": "0.20.2"
            },
            {
              "introduced": "0.21.0-0"
            },
            {
              "fixed": "0.21.2"
            },
            {
              "introduced": "0.22.0-0"
            },
            {
              "fixed": "0.22.2"
            },
            {
              "introduced": "0.23.0-0"
            },
            {
              "fixed": "0.23.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-45707",
    "GHSA-76w9-p8mg-j927",
    "GHSA-wgrg-5h56-jg27"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "On certain platforms, if a user has more than 16 groups, the\n`nix::unistd::getgrouplist` function will call the libc `getgrouplist`\nfunction with a length parameter greater than the size of the buffer it\nprovides, resulting in an out-of-bounds write and memory corruption.\n\nThe libc `getgrouplist` function takes an in/out parameter `ngroups`\nspecifying the size of the group buffer. When the buffer is too small to\nhold all of the requested user\u0027s group memberships, some libc\nimplementations, including glibc and Solaris libc, will modify `ngroups`\nto indicate the actual number of groups for the user, in addition to\nreturning an error. The version of `nix::unistd::getgrouplist` in nix\n0.16.0 and up will resize the buffer to twice its size, but will not\nread or modify the `ngroups` variable. Thus, if the user has more than\ntwice as many groups as the initial buffer size of 8, the next call to\n`getgrouplist` will then write past the end of the buffer.\n\nThe issue would require editing /etc/groups to exploit, which is usually\nonly editable by the root user.",
  "id": "RUSTSEC-2021-0119",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2021-09-27T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/nix"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0119.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nix-rust/nix/issues/1541"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Out-of-bounds write in nix::unistd::getgrouplist"
}

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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GHSA-76W9-P8MG-J927

CVE-2021-45707 (GCVE-0-2021-45707)

RUSTSEC-2021-0119 (CVE-2021-45707)

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