CVE-2019-9636

NameCVE-2019-9636
DescriptionPython 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1834-1, DLA-1835-1, DLA-2280-1, DLA-2337-1
Debian Bugs924072, 924073

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python2.7 (PTS)bullseye2.7.18-8+deb11u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python2.7sourcejessie2.7.9-2+deb8u3DLA-1834-1
python2.7sourcestretch2.7.13-2+deb9u4DLA-2337-1
python2.7source(unstable)2.7.16-2924073
python3.4sourcejessie3.4.2-1+deb8u3DLA-1835-1
python3.4source(unstable)(unfixed)
python3.5sourcestretch3.5.3-1+deb9u2DLA-2280-1
python3.5source(unstable)(unfixed)
python3.6source(unstable)(unfixed)
python3.7source(unstable)3.7.3~rc1-1924072

Notes

https://bugs.python.org/issue36216
https://github.com/python/cpython/pull/12201
https://python-security.readthedocs.io/vuln/urlsplit-nfkc-normalization.html
https://github.com/python/cpython/commit/daad2c482c91de32d8305abbccc76a5de8b3a8be (3.7.x)
https://github.com/python/cpython/commit/e37ef41289b77e0f0bb9a6aedb0360664c55bdd5 (2.7.x)
Regression fix: https://bugs.python.org/issue36742
When fixing this issue make sure to not open CVE-2019-10160.

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