Vulnerability-Lookup

OESA-2022-1767 (CVE-2020-24240)

Vulnerability from osv_openeuler – Published: 2022-07-22 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

bison security update

Details

Bison is a general-purpose parser generator that converts an annotated context-free grammar into a deterministic LR or generalized LR (GLR) parser employing LALR(1) parser tables. As an experimental feature, Bison can also generate IELR(1) or canonical LR(1) parser tables. Once you are proficient with Bison, you can use it to develop a wide range of language parsers, from those used in simple desk calculators to complex programming languages.

Security Fix(es):

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.(CVE-2020-24240)

Severity

5.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-24240	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bison-debuginfo-3.6.4-2.oe1.aarch64.rpm",
          "bison-debugsource-3.6.4-2.oe1.aarch64.rpm",
          "bison-lang-3.6.4-2.oe1.aarch64.rpm",
          "bison-devel-3.6.4-2.oe1.aarch64.rpm",
          "bison-3.6.4-2.oe1.aarch64.rpm"
        ],
        "noarch": [
          "bison-help-3.6.4-2.oe1.noarch.rpm"
        ],
        "src": [
          "bison-3.6.4-2.oe1.src.rpm"
        ],
        "x86_64": [
          "bison-3.6.4-2.oe1.x86_64.rpm",
          "bison-devel-3.6.4-2.oe1.x86_64.rpm",
          "bison-lang-3.6.4-2.oe1.x86_64.rpm",
          "bison-debugsource-3.6.4-2.oe1.x86_64.rpm",
          "bison-debuginfo-3.6.4-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "bison",
        "purl": "pkg:rpm/openEuler/bison\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.4-2.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "bison-debuginfo-3.6.4-3.oe1.aarch64.rpm",
          "bison-3.6.4-3.oe1.aarch64.rpm",
          "bison-debugsource-3.6.4-3.oe1.aarch64.rpm",
          "bison-devel-3.6.4-3.oe1.aarch64.rpm",
          "bison-lang-3.6.4-3.oe1.aarch64.rpm"
        ],
        "noarch": [
          "bison-help-3.6.4-3.oe1.noarch.rpm"
        ],
        "src": [
          "bison-3.6.4-3.oe1.src.rpm"
        ],
        "x86_64": [
          "bison-debuginfo-3.6.4-3.oe1.x86_64.rpm",
          "bison-devel-3.6.4-3.oe1.x86_64.rpm",
          "bison-3.6.4-3.oe1.x86_64.rpm",
          "bison-lang-3.6.4-3.oe1.x86_64.rpm",
          "bison-debugsource-3.6.4-3.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "bison",
        "purl": "pkg:rpm/openEuler/bison\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.4-3.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Bison is a general-purpose parser generator that converts an annotated context-free grammar into a deterministic LR or generalized LR (GLR) parser employing LALR(1) parser tables. As an experimental feature, Bison can also generate IELR(1) or canonical LR(1) parser tables. Once you are proficient with Bison, you can use it to develop a wide range of language parsers, from those used in simple desk calculators to complex programming languages.\r\n\r\nSecurity Fix(es):\r\n\r\nGNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0026apos;\\0\u0026apos; 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.(CVE-2020-24240)",
  "id": "OESA-2022-1767",
  "modified": "2026-08-06T11:05:02Z",
  "published": "2022-07-22T11:05:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1767"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-24240"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bison security update",
  "upstream": [
    "CVE-2020-24240"
  ]
}

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

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

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root Scorecard

References

3 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

Show details on NVD website

JSON

To clipboard

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        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:12:08.957Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
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            ],
            "url": "https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d"
          },
          {
            "tags": [
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            ],
            "url": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/akimd/bison/compare/v3.7...v3.7.1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "versions": [
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      ],
      "descriptions": [
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          "lang": "en",
          "value": "GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a \u0027\\0\u0027 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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-08-31T02:52:20.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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      },
      "references": [
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          "url": "https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html"
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          ],
          "url": "https://github.com/akimd/bison/compare/v3.7...v3.7.1"
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        "affects": {
          "vendor": {
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              {
                "product": {
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                          {
                            "version_value": "n/a"
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            },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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 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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OESA-2022-1767 (CVE-2020-24240)

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

Tags

Sightings

Nomenclature

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