Vulnerability-Lookup

CNVD-2021-53907

Vulnerability from cnvd - Published: 2021-07-23

Title

XScreenSaver缓冲区溢出漏洞

Description

XScreenSaver是一款使用C语言编写的开源屏幕保护程序。 XScreenSaver存在缓冲区错误漏洞，该漏洞源于当应用有超过10个可断开的视频输出时，update_screen_layout()会引起缓冲区溢出。攻击者可通过该漏洞绕过身份验证机制。

Severity

低

Patch Name

XScreenSaver缓冲区溢出漏洞的补丁

Patch Description

XScreenSaver是一款使用C语言编写的开源屏幕保护程序。 XScreenSaver存在缓冲区错误漏洞，该漏洞源于当应用有超过10个可断开的视频输出时，update_screen_layout()会引起缓冲区溢出。攻击者可通过该漏洞绕过身份验证机制。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

目前厂商已发布升级补丁以修复漏洞，详情请关注厂商主页： https://github.com/QubesOS/qubes-issues/issues/6595

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-34557

Impacted products

Name
Xscreensaver Xscreensaver 5.45

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-34557"
    }
  },
  "description": "XScreenSaver\u662f\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\u7684\u5f00\u6e90\u5c4f\u5e55\u4fdd\u62a4\u7a0b\u5e8f\u3002\n\nXScreenSaver\u5b58\u5728\u7f13\u51b2\u533a\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5f53\u5e94\u7528\u6709\u8d85\u8fc710\u4e2a\u53ef\u65ad\u5f00\u7684\u89c6\u9891\u8f93\u51fa\u65f6\uff0cupdate_screen_layout()\u4f1a\u5f15\u8d77\u7f13\u51b2\u533a\u6ea2\u51fa\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u673a\u5236\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8be6\u60c5\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\uff1a\r\nhttps://github.com/QubesOS/qubes-issues/issues/6595",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-53907",
  "openTime": "2021-07-23",
  "patchDescription": "XScreenSaver\u662f\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\u7684\u5f00\u6e90\u5c4f\u5e55\u4fdd\u62a4\u7a0b\u5e8f\u3002\r\n\r\nXScreenSaver\u5b58\u5728\u7f13\u51b2\u533a\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5f53\u5e94\u7528\u6709\u8d85\u8fc710\u4e2a\u53ef\u65ad\u5f00\u7684\u89c6\u9891\u8f93\u51fa\u65f6\uff0cupdate_screen_layout()\u4f1a\u5f15\u8d77\u7f13\u51b2\u533a\u6ea2\u51fa\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u673a\u5236\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": "XScreenSaver\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Xscreensaver Xscreensaver 5.45"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-34557",
  "serverity": "\u4f4e",
  "submitTime": "2021-06-12",
  "title": "XScreenSaver\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2021-34557 (GCVE-0-2021-34557)

Vulnerability from cvelistv5 – Published: 2021-06-10 15:54 – Updated: 2024-08-04 00:12

Summary

XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

7 references

URL	Tags
https://github.com/QubesOS/qubes-issues/issues/6595	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
https://github.com/QubesOS/qubes-secpack/blob/mas…	x_refsource_MISC
https://github.com/QubesOS/qubes-xscreensaver/blo…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/06/11/1	mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/07/06/2	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Show details on NVD website

JSON

To clipboard

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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.