Vulnerability-Lookup

CNVD-2021-60526

Vulnerability from cnvd - Published: 2021-08-10

Title

Linux kernel信息泄露漏洞（CNVD-2021-60526）

Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于Linux kernel 功能中的数据输出过多，用户态应用程序可以读取 sigpage 的内容，从而泄漏内核内存内容。攻击者可利用该漏洞允许本地用户访问可能敏感的信息。

Severity

低

Patch Name

Linux kernel信息泄露漏洞（CNVD-2021-60526）的补丁

Patch Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于Linux kernel 功能中的数据输出过多，用户态应用程序可以读取 sigpage 的内容，从而泄漏内核内存内容。攻击者可利用该漏洞允许本地用户访问可能敏感的信息。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://www.cybersecurity-help.cz/vdb/SB2021062704

Reference

https://exchange.xforce.ibmcloud.com/vulnerabilities/204429

Impacted products

Name
Linux Linux kernel

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-21781"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\n\nLinux kernel\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eLinux kernel \u529f\u80fd\u4e2d\u7684\u6570\u636e\u8f93\u51fa\u8fc7\u591a\uff0c\u7528\u6237\u6001\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u8bfb\u53d6 sigpage \u7684\u5185\u5bb9\uff0c\u4ece\u800c\u6cc4\u6f0f\u5185\u6838\u5185\u5b58\u5185\u5bb9\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5141\u8bb8\u672c\u5730\u7528\u6237\u8bbf\u95ee\u53ef\u80fd\u654f\u611f\u7684\u4fe1\u606f\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://www.cybersecurity-help.cz/vdb/SB2021062704",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-60526",
  "openTime": "2021-08-10",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eLinux kernel \u529f\u80fd\u4e2d\u7684\u6570\u636e\u8f93\u51fa\u8fc7\u591a\uff0c\u7528\u6237\u6001\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u8bfb\u53d6 sigpage \u7684\u5185\u5bb9\uff0c\u4ece\u800c\u6cc4\u6f0f\u5185\u6838\u5185\u5b58\u5185\u5bb9\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5141\u8bb8\u672c\u5730\u7528\u6237\u8bbf\u95ee\u53ef\u80fd\u654f\u611f\u7684\u4fe1\u606f\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": "Linux kernel\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2021-60526\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Linux kernel"
  },
  "referenceLink": "https://exchange.xforce.ibmcloud.com/vulnerabilities/204429",
  "serverity": "\u4f4e",
  "submitTime": "2021-06-29",
  "title": "Linux kernel\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2021-60526\uff09"
}

CVE-2021-21781 (GCVE-0-2021-21781)

Vulnerability from cvelistv5 – Published: 2021-08-18 14:37 – Updated: 2024-08-03 18:23

Summary

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

Severity

4 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

talos mitre root

References

2 references

URL	Tags
https://talosintelligence.com/vulnerability_repor…	x_refsource_MISC
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Linux Kernel	Affected: Linux Kernel v5.4.54, Linux Kernel v5.4.66

Show details on NVD website

JSON

To clipboard

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        }
      ],
      "metrics": [
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            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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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

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