CVE-2016-6210

NameCVE-2016-6210
Descriptionsshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-578-1, DSA-3626-1
Debian Bugs831902

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)buster1:7.9p1-10+deb10u2fixed
buster (security)1:7.9p1-10+deb10u4fixed
bullseye (security), bullseye1:8.4p1-5+deb11u3fixed
bookworm, bookworm (security)1:9.2p1-2+deb12u2fixed
trixie1:9.6p1-4fixed
sid1:9.7p1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensshsourcewheezy1:6.0p1-4+deb7u5DLA-578-1
opensshsourcejessie1:6.7p1-5+deb8u3DSA-3626-1
opensshsource(unstable)1:7.2p2-6831902

Notes

http://seclists.org/fulldisclosure/2016/Jul/51
https://anongit.mindrot.org/openssh.git/commit/?id=9286875a73b2de7736b5e50692739d314cd8d9dc
https://anongit.mindrot.org/openssh.git/commit/?id=283b97ff33ea2c641161950849931bd578de6946
Suggested to cherry-pick as well: https://anongit.mindrot.org/openssh.git/commit/?id=dbf788b4d9d9490a5fff08a7b09888272bb10fcc
otherwise the mitigiation isn't very effective for systems with a locked root account.

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