CVE-2021-41131

描述

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.

如何修補 CVE-2021-41131

要修補 CVE-2021-41131,請將受影響套件升級到下列已修補版本。

• —升級至 0.19.0 或更新版本
• —升級至 4ad7ae48fda594b640139c3b7eae21ed5155a102 或更新版本

CVE-2021-41131 正在被利用嗎?

低 — EPSS 為 0.6%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• from 0, < 0.19.0
• from 0, < 4ad7ae48fda594b640139c3b7eae21ed5155a102 | from 0, < 0.19.0

CVSS 分數

參考連結(6)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-41131
• PATCHgithub.com/theupdateframework/python-tuf
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tuf/PYSEC-2021-376.yaml
• WEBgithub.com/theupdateframework/python-tuf/commit/4ad7ae48fda594b640139c3b7eae21ed5155a102