github - ghsa-5xv5-wxfg-845r

GHSA-5XV5-WXFG-845R

Vulnerability from github – Published: 2022-05-24 17:26 – Updated: 2022-05-24 17:26

Details

GNU Bison 3.7 has a use after free (UAF) vulnerability. A local attacker may execute bison with crafted input file containing a NULL byte, which could triggers UAF and thus cause system crash.

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  "affected": [],
  "aliases": [
    "CVE-2020-24240"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-08-25T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "GNU Bison 3.7 has a use after free (UAF) vulnerability. A local attacker may execute bison with crafted input file containing a NULL byte, which could triggers UAF and thus cause system crash.",
  "id": "GHSA-5xv5-wxfg-845r",
  "modified": "2022-05-24T17:26:33Z",
  "published": "2022-05-24T17:26:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-24240"
    },
    {
      "type": "WEB",
      "url": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/akimd/bison/compare/v3.7...v3.7.1"
    },
    {
      "type": "WEB",
      "url": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2020-24240 (GCVE-0-2020-24240)

Vulnerability from cvelistv5 – Published: 2020-08-25 13:45 – Updated: 2024-08-04 15:12

Summary

GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://github.com/akimd/bison/commit/be95a4fe295…	x_refsource_MISC
	https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html	x_refsource_MISC
	https://github.com/akimd/bison/compare/v3.7...v3.7.1	x_refsource_MISC

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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-5XV5-WXFG-845R

CVE-2020-24240 (GCVE-0-2020-24240)

Tags

Sightings

Nomenclature