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CVE-2021-41131— Client metadata path-traversal in python-tuf

Quick assessment

Affected
theupdateframework python-tuf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

python-tuf是开源的一个保护软件更新系统的框架，是The Update Framework (TUF) 的 Python 参考实现。 python-tuf 0.19 之前版本存在路径遍历漏洞，该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。

CVSS 7.5 · High EPSS 1.45% · P73
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I. Basic Information for CVE-2021-41131

Vulnerability Information
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Vulnerability Title
Client metadata path-traversal in python-tuf
Source: CVE Program / CVE List V5
Vulnerability Description
python-tuf is a Python reference implementation of The Update Framework (TUF). In both clients (`tuf/client` and `tuf/ngclient`), there is a path traversal vulnerability that in the worst case can overwrite files ending in `.json` anywhere on the client system on a call to `get_one_valid_targetinfo()`. It occurs because the rolename is used to form the filename, and may contain path traversal characters (ie `../../name.json`). The impact is mitigated by a few facts: It only affects implementations that allow arbitrary rolename selection for delegated targets metadata, The attack requires the ability to A) insert new metadata for the path-traversing role and B) get the role delegated by an existing targets metadata, The written file content is heavily restricted since it needs to be a valid, signed targets file. The file extension is always .json. A fix is available in version 0.19 or newer. There are no workarounds that do not require code changes. Clients can restrict the allowed character set for rolenames, or they can store metadata in files named in a way that is not vulnerable: neither of these approaches is possible without modifying python-tuf.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
python-tuf 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
python-tuf是开源的一个保护软件更新系统的框架，是The Update Framework (TUF) 的 Python 参考实现。 python-tuf 0.19 之前版本存在路径遍历漏洞，该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
theupdateframework python-tuf < 0.19.0 -

II. Public POCs for CVE-2021-41131

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III. Intelligence Information for CVE-2021-41131

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Patches & Fixes for CVE-2021-41131 (1)

Vendor Advisories for CVE-2021-41131 (1)

Other References for CVE-2021-41131 (1)

IV. Related Vulnerabilities

Same vendor: theupdateframework
Same weakness: CWE-22

V. Comments for CVE-2021-41131

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