CVE-2017-18640

NameCVE-2017-18640
DescriptionThe Alias feature in SnakeYAML 1.18 allows entity expansion during a load operation, a related issue to CVE-2003-1564.
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)
NVD severitymedium
Debian Bugs952683

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
snakeyaml (PTS)jessie1.12-2vulnerable
stretch1.17-1vulnerable
buster1.23-1vulnerable
bullseye, sid1.26+ds-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
snakeyamlsource(unstable)1.25+ds-3952683

Notes

[buster] - snakeyaml <no-dsa> (Minor issue)
[stretch] - snakeyaml <no-dsa> (Minor issue)
[jessie] - snakeyaml <no-dsa> (unclear security impact)
https://bitbucket.org/asomov/snakeyaml/issues/377/allow-configuration-for-preventing-billion
Patch to introduce a configuration option to restrict aliases for
collections:
https://bitbucket.org/asomov/snakeyaml/commits/da11ddbd91c1f8392ea932b37fa48110fa54ed8c

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