Bug#1011747: pyjwt: CVE-2022-29217 - Key confusion through non-blocklisted public key formats

[Neil Williams]

Source: pyjwt
Version: 2.3.0-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: code...@debian.org, Debian Security Team <te...@security.debian.org>

Hi,

The following vulnerability was published for pyjwt.

CVE-2022-29217[0]:
| PyJWT is a Python implementation of RFC 7519. PyJWT supports multiple
| different JWT signing algorithms. With JWT, an attacker submitting the
| JWT token can choose the used signing algorithm. The PyJWT library
| requires that the application chooses what algorithms are supported.
| The application can specify `jwt.algorithms.get_default_algorithms()`
| to get support for all algorithms, or specify a single algorithm. The
| issue is not that big as
| `algorithms=jwt.algorithms.get_default_algorithms()` has to be used.
| Users should upgrade to v2.4.0 to receive a patch for this issue. As a
| workaround, always be explicit with the algorithms that are accepted
| and expected when decoding.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2022-29217
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29217

Please adjust the affected versions in the BTS as needed.




-- System Information:
Debian Release: bookworm/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.17.0-2-amd64 (SMP w/6 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled