Vulnerability-Lookup

CNVD-2020-49957

Vulnerability from cnvd - Published: 2020-09-02

Title

GNU Bison释放后重用漏洞

Description

GNU Bison是一款自由软件，用于自动生成语法分析器程序。 GNU Bison 3.7存在释放后重用漏洞。本地攻击者可通过包含NULL字节的特制输入文件利用该漏洞导致系统崩溃。

Severity

中

Patch Name

GNU Bison释放后重用漏洞的补丁

Patch Description

GNU Bison是一款自由软件，用于自动生成语法分析器程序。 GNU Bison 3.7存在释放后重用漏洞。本地攻击者可通过包含NULL字节的特制输入文件利用该漏洞导致系统崩溃。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-24240

Impacted products

Name
GNU Bison 3.7

Show details on source website

JSON

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-24240",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-24240"
    }
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  "description": "GNU Bison\u662f\u4e00\u6b3e\u81ea\u7531\u8f6f\u4ef6\uff0c\u7528\u4e8e\u81ea\u52a8\u751f\u6210\u8bed\u6cd5\u5206\u6790\u5668\u7a0b\u5e8f\u3002\n\nGNU Bison 3.7\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u5305\u542bNULL\u5b57\u8282\u7684\u7279\u5236\u8f93\u5165\u6587\u4ef6\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-49957",
  "openTime": "2020-09-02",
  "patchDescription": "GNU Bison\u662f\u4e00\u6b3e\u81ea\u7531\u8f6f\u4ef6\uff0c\u7528\u4e8e\u81ea\u52a8\u751f\u6210\u8bed\u6cd5\u5206\u6790\u5668\u7a0b\u5e8f\u3002\r\n\r\nGNU Bison 3.7\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\u3002\u672c\u5730\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u5305\u542bNULL\u5b57\u8282\u7684\u7279\u5236\u8f93\u5165\u6587\u4ef6\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "GNU Bison\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "GNU Bison 3.7"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-24240",
  "serverity": "\u4e2d",
  "submitTime": "2020-08-26",
  "title": "GNU Bison\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e"
}

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 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

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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CNVD-2020-49957

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

Tags

Sightings

Nomenclature

Related by attack behaviour