CVE-2018-14647

NameCVE-2018-14647
DescriptionPython's elementtree C accelerator failed to initialise Expat's hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by constructing an XML document that would cause pathological hash collisions in Expat's internal data structures, consuming large amounts CPU and RAM. Python 3.8, 3.7, 3.6, 3.5, 3.4, 2.7 are believed to be vulnerable.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1834-1, DLA-1835-1, DSA-4306-1, DSA-4307-1
NVD severitymedium (attack range: remote)
Debian Bugs921039

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python2.7 (PTS)jessie2.7.9-2+deb8u1vulnerable
jessie (security)2.7.9-2+deb8u5fixed
stretch (security), stretch2.7.13-2+deb9u3fixed
buster2.7.16-2fixed
bullseye, sid2.7.17~rc1-1fixed
python3.4 (PTS)jessie3.4.2-1vulnerable
jessie (security)3.4.2-1+deb8u7fixed
python3.5 (PTS)stretch (security), stretch3.5.3-1+deb9u1fixed
python3.7 (PTS)buster3.7.3-2fixed
bullseye3.7.5~rc1-2fixed
sid3.7.5-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python2.7source(unstable)2.7.15-5medium921039
python2.7sourcejessie2.7.9-2+deb8u3mediumDLA-1834-1
python2.7sourcestretch2.7.13-2+deb9u3mediumDSA-4306-1
python3.4source(unstable)(unfixed)medium
python3.4sourcejessie3.4.2-1+deb8u3mediumDLA-1835-1
python3.5source(unstable)(unfixed)medium
python3.5sourcestretch3.5.3-1+deb9u1mediumDSA-4307-1
python3.6source(unstable)3.6.7~rc1-1medium
python3.7source(unstable)3.7.0-7medium

Notes

[jessie] - python3.4 <postponed> (minor issue)
https://bugs.python.org/issue34623
master: https://github.com/python/cpython/commit/cb5778f00ce48631c7140f33ba242496aaf7102b
3.7: https://github.com/python/cpython/commit/470a435f3b42c9be5fdb7f7b04f3df5663ba7305
3.6: https://github.com/python/cpython/commit/f7666e828cc3d5873136473ea36ba2013d624fa1
2.7: https://github.com/python/cpython/commit/18b20bad75b4ff0486940fba4ec680e96e70f3a2

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