Vulnerability-Lookup

CNVD-2021-39694

Vulnerability from cnvd - Published: 2021-06-04

Title

Samba缓冲区溢出漏洞

Description

Samba是Samba团队的一套可使UNIX系列的操作系统与微软Windows操作系统的SMB/CIFS网络协议做连结的自由软件。该软件支持共享打印机、互相传输资料文件等。 Samba存在缓冲区溢出漏洞，该漏洞源于在将Windows组标识(sid)映射到unix组标识(gid)时存在边界条件，攻击者可利用漏洞在Samba服务器进程令牌中创建负面的idmap缓存项。

Severity

中

Patch Name

Samba缓冲区溢出漏洞的补丁

Patch Description

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://bugzilla.redhat.com/show_bug.cgi?id=1949442

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-20254

Impacted products

Name
['Samba Samba <4.14.4', 'Samba Samba <4.13.8', 'Samba Samba <4.12.15']

Show details on source website

JSON

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    "cve": {
      "cveNumber": "CVE-2021-20254"
    }
  },
  "description": "Samba\u662fSamba\u56e2\u961f\u7684\u4e00\u5957\u53ef\u4f7fUNIX\u7cfb\u5217\u7684\u64cd\u4f5c\u7cfb\u7edf\u4e0e\u5fae\u8f6fWindows\u64cd\u4f5c\u7cfb\u7edf\u7684SMB/CIFS\u7f51\u7edc\u534f\u8bae\u505a\u8fde\u7ed3\u7684\u81ea\u7531\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u652f\u6301\u5171\u4eab\u6253\u5370\u673a\u3001\u4e92\u76f8\u4f20\u8f93\u8d44\u6599\u6587\u4ef6\u7b49\u3002\n\nSamba\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u5c06Windows\u7ec4\u6807\u8bc6(sid)\u6620\u5c04\u5230unix\u7ec4\u6807\u8bc6(gid)\u65f6\u5b58\u5728\u8fb9\u754c\u6761\u4ef6\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u5728Samba\u670d\u52a1\u5668\u8fdb\u7a0b\u4ee4\u724c\u4e2d\u521b\u5efa\u8d1f\u9762\u7684idmap\u7f13\u5b58\u9879\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://bugzilla.redhat.com/show_bug.cgi?id=1949442",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-39694",
  "openTime": "2021-06-04",
  "patchDescription": "Samba\u662fSamba\u56e2\u961f\u7684\u4e00\u5957\u53ef\u4f7fUNIX\u7cfb\u5217\u7684\u64cd\u4f5c\u7cfb\u7edf\u4e0e\u5fae\u8f6fWindows\u64cd\u4f5c\u7cfb\u7edf\u7684SMB/CIFS\u7f51\u7edc\u534f\u8bae\u505a\u8fde\u7ed3\u7684\u81ea\u7531\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u652f\u6301\u5171\u4eab\u6253\u5370\u673a\u3001\u4e92\u76f8\u4f20\u8f93\u8d44\u6599\u6587\u4ef6\u7b49\u3002\r\n\r\nSamba\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u5c06Windows\u7ec4\u6807\u8bc6(sid)\u6620\u5c04\u5230unix\u7ec4\u6807\u8bc6(gid)\u65f6\u5b58\u5728\u8fb9\u754c\u6761\u4ef6\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u5728Samba\u670d\u52a1\u5668\u8fdb\u7a0b\u4ee4\u724c\u4e2d\u521b\u5efa\u8d1f\u9762\u7684idmap\u7f13\u5b58\u9879\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": "Samba\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e \u7684\u8865\u4e01",
  "products": {
    "product": [
      "Samba Samba \u003c4.14.4",
      "Samba Samba \u003c4.13.8",
      "Samba Samba \u003c4.12.15"
    ]
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-20254",
  "serverity": "\u4e2d",
  "submitTime": "2021-05-14",
  "title": "Samba\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2021-20254 (GCVE-0-2021-20254)

Vulnerability from cvelistv5 – Published: 2021-05-05 13:36 – Updated: 2024-08-03 17:37

Summary

A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.

Severity

No CVSS data available.

CWE

CWE-125

Assigner

redhat redhat root

References

7 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1949442	x_refsource_MISC
https://www.samba.org/samba/security/CVE-2021-202…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021043…	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://security.gentoo.org/glsa/202105-22	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	samba	Affected: samba 4.14.1, samba 4.13.6, samba 4.12.13

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.