Vulnerability-Lookup

CNVD-2022-13365

Vulnerability from cnvd - Published: 2022-02-23

Title

snapd输入验证错误漏洞

Description

Snapd是开源的一个跨平台的包管理工具。 snapd存在输入验证错误漏洞，攻击者可利用该漏洞导致snap能够通过格式错误的内容界面和布局声明注入任意AppArmor策略规则，从而逃脱严格的snap限制。

Severity

高

Patch Name

snapd输入验证错误漏洞的补丁

Patch Description

Snapd是开源的一个跨平台的包管理工具。 snapd存在输入验证错误漏洞，攻击者可利用该漏洞导致snap能够通过格式错误的内容界面和布局声明注入任意AppArmor策略规则，从而逃脱严格的snap限制。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

厂商已发布了漏洞修复程序，请及时关注更新： https://ubuntu.com/security/notices/USN-5292-1

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-4120

Impacted products

Name
snapd snapd 2.54.2

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-4120"
    }
  },
  "description": "Snapd\u662f\u5f00\u6e90\u7684\u4e00\u4e2a\u8de8\u5e73\u53f0\u7684\u5305\u7ba1\u7406\u5de5\u5177\u3002\n\nsnapd\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4snap\u80fd\u591f\u901a\u8fc7\u683c\u5f0f\u9519\u8bef\u7684\u5185\u5bb9\u754c\u9762\u548c\u5e03\u5c40\u58f0\u660e\u6ce8\u5165\u4efb\u610fAppArmor\u7b56\u7565\u89c4\u5219\uff0c\u4ece\u800c\u9003\u8131\u4e25\u683c\u7684snap\u9650\u5236\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://ubuntu.com/security/notices/USN-5292-1",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2022-13365",
  "openTime": "2022-02-23",
  "patchDescription": "Snapd\u662f\u5f00\u6e90\u7684\u4e00\u4e2a\u8de8\u5e73\u53f0\u7684\u5305\u7ba1\u7406\u5de5\u5177\u3002\r\n\r\nsnapd\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4snap\u80fd\u591f\u901a\u8fc7\u683c\u5f0f\u9519\u8bef\u7684\u5185\u5bb9\u754c\u9762\u548c\u5e03\u5c40\u58f0\u660e\u6ce8\u5165\u4efb\u610fAppArmor\u7b56\u7565\u89c4\u5219\uff0c\u4ece\u800c\u9003\u8131\u4e25\u683c\u7684snap\u9650\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": "snapd\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "snapd snapd 2.54.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-4120",
  "serverity": "\u9ad8",
  "submitTime": "2022-02-18",
  "title": "snapd\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2021-4120 (GCVE-0-2021-4120)

Vulnerability from cvelistv5 – Published: 2022-02-17 22:15 – Updated: 2024-08-03 17:16

Title

snapd could be made to bypass intended access restrictions through snap content interfaces and layout paths

Summary

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CWE

CWE-20 - Improper Input Validation

Assigner

canonical mitre root

References

5 references

URL	Tags
https://ubuntu.com/security/notices/USN-5292-1	x_refsource_MISC
https://bugs.launchpad.net/snapd/+bug/1949368	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2022/02/18/2	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
Canonical Ltd.	snapd	Affected: unspecified , ≤ 2.54.2 (custom)

Credits

Ian Johnson

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.