Vulnerability-Lookup

CNVD-2021-102419

Vulnerability from cnvd - Published: 2021-12-27

Title

libxls空指针解引用漏洞

Description

libxls是一个可以读取Excel（xls）文件的C库。 libxls 1.6.2版中的xls.c中的xls_getWorkSheet函数存在空指针解引用漏洞。攻击者可通过特制XLS文件利用该漏洞导致拒绝服务。

Severity

中

Patch Name

libxls空指针解引用漏洞的补丁

Patch Description

libxls是一个可以读取Excel（xls）文件的C库。 libxls 1.6.2版中的xls.c中的xls_getWorkSheet函数存在空指针解引用漏洞。攻击者可通过特制XLS文件利用该漏洞导致拒绝服务。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/libxls/libxls/pull/95/commits

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-27836

Impacted products

Name
libxls libxls 1.6.2

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-27836",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-27836"
    }
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  "description": "libxls\u662f\u4e00\u4e2a\u53ef\u4ee5\u8bfb\u53d6Excel\uff08xls\uff09\u6587\u4ef6\u7684C\u5e93\u3002\n\nlibxls 1.6.2\u7248\u4e2d\u7684xls.c\u4e2d\u7684xls_getWorkSheet\u51fd\u6570\u5b58\u5728\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236XLS\u6587\u4ef6\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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/libxls/libxls/pull/95/commits",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-102419",
  "openTime": "2021-12-27",
  "patchDescription": "libxls\u662f\u4e00\u4e2a\u53ef\u4ee5\u8bfb\u53d6Excel\uff08xls\uff09\u6587\u4ef6\u7684C\u5e93\u3002\r\n\r\nlibxls 1.6.2\u7248\u4e2d\u7684xls.c\u4e2d\u7684xls_getWorkSheet\u51fd\u6570\u5b58\u5728\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236XLS\u6587\u4ef6\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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": "libxls\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "libxls libxls 1.6.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-27836",
  "serverity": "\u4e2d",
  "submitTime": "2021-11-04",
  "title": "libxls\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e"
}

CVE-2021-27836 (GCVE-0-2021-27836)

Vulnerability from cvelistv5 – Published: 2021-11-03 16:07 – Updated: 2024-08-03 21:33

Summary

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://github.com/libxls/libxls/issues/94	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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.