| Name | CVE-2018-10903 |
| Description | A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 904072 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| python-cryptography (PTS) | jessie | 0.6.1-1+deb8u1 | fixed |
| stretch | 1.7.1-3+deb9u2 | fixed |
| buster, buster (lts) | 2.6.1-3+deb10u5 | fixed |
| buster (security) | 2.6.1-3+deb10u4 | fixed |
| bullseye | 3.3.2-1 | fixed |
| bullseye (security) | 3.3.2-1+deb11u1 | fixed |
| bookworm | 38.0.4-3+deb12u1 | fixed |
| bookworm (security) | 38.0.4-3~deb12u1 | fixed |
| sid, trixie | 43.0.0-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[stretch] - python-cryptography <not-affected> (Vulnerable code introduced later)
[jessie] - python-cryptography <not-affected> (Vulnerable code introduced later)
https://github.com//pyca/cryptography/pull/4342
https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef