| Name | CVE-2021-29921 |
| Description | In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses. |
| 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 | 989195 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| pypy3 (PTS) | bullseye | 7.3.5+dfsg-2+deb11u2 | fixed |
| bullseye (security) | 7.3.5+dfsg-2+deb11u3 | fixed |
| bookworm | 7.3.11+dfsg-2+deb12u2 | fixed |
| sid, trixie | 7.3.17+dfsg-2 | fixed |
| python2.7 (PTS) | bullseye | 2.7.18-8+deb11u1 | fixed |
| python3.9 (PTS) | bullseye | 3.9.2-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| pypy3 | source | bullseye | (not affected) | | | |
| pypy3 | source | (unstable) | 7.3.8+dfsg-1 | | | |
| python2.7 | source | (unstable) | (not affected) | | | |
| python3.9 | source | experimental | 3.9.5-1 | | | |
| python3.9 | source | (unstable) | 3.9.7-1 | | | 989195 |
Notes
[bullseye] - python3.9 <no-dsa> (Minor issue)
- python2.7 <not-affected> (Vulnerable code introduced later)
[buster] - pypy3 <no-dsa> (Minor issue)
[bullseye] - pypy3 <not-affected> (Vulnerable code introduced later)
https://bugs.python.org/issue36384#msg392423
https://github.com/python/cpython/commit/60ce8f0be6354ad565393ab449d8de5d713f35bc (v3.10.0b1)
https://github.com/python/cpython/commit/5374fbc31446364bf5f12e5ab88c5493c35eaf04 (v3.9.5)
Introduced by: https://github.com/python/cpython/commit/e653d4d8e820a7a004ad399530af0135b45db27a (v3.8.0a4)