CVE-2018-15919

NameCVE-2018-15919
DescriptionRemotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'
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)
Debian Bugs907503

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)jessie1:6.7p1-5+deb8u4vulnerable
jessie (security)1:6.7p1-5+deb8u8vulnerable
stretch1:7.4p1-10+deb9u7vulnerable
stretch (security)1:7.4p1-10+deb9u6vulnerable
buster1:7.9p1-10vulnerable
buster (security)1:7.9p1-10+deb10u1vulnerable
bullseye, sid1:8.1p1-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensshsource(unstable)(unfixed)low907503

Notes

[buster] - openssh <ignored> (Minor issue)
[stretch] - openssh <ignored> (Minor issue)
[jessie] - openssh <no-dsa> (Minor issue)
http://www.openwall.com/lists/oss-security/2018/08/27/2

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