CVE-2021-41131

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Summary

CVECVE-2021-41131
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-10-19 18:15:00 UTC
Updated2021-10-22 20:44:00 UTC
Descriptionpython-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.

Risk And Classification

Problem Types: CWE-22

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Linuxfoundation The Update Framework All All All All

References

ReferenceSourceLinkTags
Client metadata path-traversal flaw can result in files written outside of metadata store · Advisory · theupdateframework/python-tuf · GitHub CONFIRM github.com
Merge pull request from GHSA-wjw6-2cqr-j4qr · theupdateframework/python-tuf@4ad7ae4 · GitHub MISC github.com
Metadata API: Delegation role names validation · Issue #1527 · theupdateframework/python-tuf · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 690798 Free Berkeley Software Distribution (FreeBSD) Security Update for the update framwork (85d976be-93e3-11ec-aaad-14dae9d5a9d2)
  • 980406 Python (pip) Security Update for tuf (GHSA-wjw6-2cqr-j4qr)

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