| Name | CVE-2016-20012 |
| Description | OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| openssh (PTS) | jessie, jessie (lts) | 1:6.7p1-5+deb8u10 | vulnerable |
| stretch (security) | 1:7.4p1-10+deb9u6 | vulnerable |
| stretch (lts), stretch | 1:7.4p1-10+deb9u9 | vulnerable |
| buster (security), buster, buster (lts) | 1:7.9p1-10+deb10u4 | vulnerable |
| bullseye (security), bullseye | 1:8.4p1-5+deb11u3 | vulnerable |
| bookworm (security), bookworm | 1:9.2p1-2+deb12u3 | vulnerable |
| sid, trixie | 1:9.9p1-3 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| openssh | source | (unstable) | (unfixed) | unimportant | | |
Notes
https://github.com/openssh/openssh-portable/pull/270
Negligible impact, not treated as a security issue by upstream