CVE-2019-8955

NameCVE-2019-8955
DescriptionIn Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
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 (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tor (PTS)jessie (security), jessie0.2.5.16-1fixed
stretch0.2.9.16-1fixed
stretch (security)0.2.9.15-1fixed
buster, sid0.3.5.8-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
torsource(unstable)0.3.5.8-1medium
torsourcejessie(not affected)
torsourcestretch(not affected)

Notes

[stretch] - tor <not-affected> (Only affects 0.3.2.1 and later)
[jessie] - tor <not-affected> (Only affects 0.3.2.1 and later)
https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312
https://trac.torproject.org/projects/tor/ticket/29168

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