CVE-2018-10933

NameCVE-2018-10933
DescriptionA vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4. A malicious client could create channels without first performing authentication, resulting in unauthorized access.
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-1548-1, DSA-4322-1
NVD severitymedium (attack range: remote)
Debian Bugs911149

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libssh (PTS)jessie0.6.3-4+deb8u2vulnerable
jessie (security)0.6.3-4+deb8u3fixed
stretch (security), stretch0.7.3-2+deb9u1fixed
buster, sid0.8.4-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libsshsource(unstable)0.8.4-1medium911149
libsshsourcejessie0.6.3-4+deb8u3mediumDLA-1548-1
libsshsourcestretch0.7.3-2+deb9u1mediumDSA-4322-1

Notes

https://www.libssh.org/2018/10/16/libssh-0-8-4-and-0-7-6-security-and-bugfix-release/
https://bugs.libssh.org/T101
https://www.libssh.org/security/advisories/CVE-2018-10933.txt
POC: https://www.openwall.com/lists/oss-security/2018/10/17/5
https://git.libssh.org/projects/libssh.git/commit/?id=2bddafeb709eacc80ad31fec40479f9b628a8bd7 (master)
https://git.libssh.org/projects/libssh.git/commit/?id=825f4ba96407abe8cebb046a7503fa2bf5de9df6 (master)
https://git.libssh.org/projects/libssh.git/commit/?id=20981bf2296202e95d7919394d4610ae3a876cfa (master)
https://git.libssh.org/projects/libssh.git/commit/?id=5d7414467d6dac100a93df761b06de5cd07fc69a (master)
https://git.libssh.org/projects/libssh.git/commit/?id=459868c4a57d2d11cf7835655a8d1a5cf034ccb4 (master)
https://git.libssh.org/projects/libssh.git/commit/?id=68b0c7a93448123cc0d6a04d3df40d92a3fd0a67 (master)
https://git.libssh.org/projects/libssh.git/commit/?id=75be012b4a14f4550ce6ad3f126e559f44dbde76 (master)
https://git.libssh.org/projects/libssh.git/commit/?id=e1548a71bdac73da084174ab1d6d2713edd93f6e (master)
Fixed in 0.7.6, 0.8.4 upstream

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