| Name | CVE-2021-23336 |
| Description | The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2569-1, DLA-2619-1, DLA-2628-1, DLA-3164-1, DLA-3575-1 |
| Debian Bugs | 983090 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pypy3 (PTS) | bullseye (security), bullseye | 7.3.5+dfsg-2+deb11u2 | fixed |
| bookworm | 7.3.11+dfsg-2+deb12u2 | fixed | |
| sid, trixie | 7.3.16+dfsg-2 | fixed | |
| python-django (PTS) | bullseye (security), bullseye | 2:2.2.28-1~deb11u2 | fixed |
| bookworm, bookworm (security) | 3:3.2.19-1+deb12u1 | fixed | |
| sid, trixie | 3:4.2.14-1 | fixed | |
| python2.7 (PTS) | bullseye | 2.7.18-8+deb11u1 | fixed |
| python3.9 (PTS) | bullseye | 3.9.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pypy3 | source | (unstable) | 7.3.3+dfsg-3 | |||
| python-django | source | stretch | 1:1.10.7-2+deb9u11 | DLA-2569-1 | ||
| python-django | source | buster | 1:1.11.29-1+deb10u2 | DLA-3164-1 | ||
| python-django | source | (unstable) | 2:2.2.19-1 | 983090 | ||
| python2.7 | source | experimental | 2.7.18-13.1~exp1 | |||
| python2.7 | source | stretch | 2.7.13-2+deb9u5 | DLA-2628-1 | ||
| python2.7 | source | buster | 2.7.16-2+deb10u3 | DLA-3575-1 | ||
| python2.7 | source | bullseye | 2.7.18-8+deb11u1 | |||
| python2.7 | source | (unstable) | 2.7.18-13.1 | |||
| python3.5 | source | stretch | 3.5.3-1+deb9u4 | DLA-2619-1 | ||
| python3.5 | source | (unstable) | (unfixed) | |||
| python3.7 | source | (unstable) | (unfixed) | |||
| python3.8 | source | (unstable) | (unfixed) | |||
| python3.9 | source | (unstable) | 3.9.2-1 |
[buster] - python3.9 <ignored> (Will break existing applications, don't backport to released suites)
[buster] - python3.7 <ignored> (Will break existing applications, don't backport to released suites)
[buster] - pypy3 <no-dsa> (Minor issue)
https://github.com/python/cpython/pull/24297
https://github.com/python/cpython/commit/fcbe0cb04d35189401c0c880ebfb4311e952d776 (master)
https://github.com/python/cpython/commit/c9f07813ab8e664d8c34413c4fc2d4f86c061a92 (3.9)
https://github.com/python/cpython/commit/d0d4d30882fe3ab9b1badbecf5d15d94326fd13e (3.7)
https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/