| Name | CVE-2016-6210 |
| Description | sshd 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-578-1, DSA-3626-1 |
| Debian Bugs | 831902 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| openssh (PTS) | bullseye | 1:8.4p1-5+deb11u3 | fixed |
| bullseye (security) | 1:8.4p1-5+deb11u5 | fixed | |
| bookworm | 1:9.2p1-2+deb12u7 | fixed | |
| bookworm (security) | 1:9.2p1-2+deb12u5 | fixed | |
| trixie | 1:10.0p1-7 | fixed | |
| forky, sid | 1:10.2p1-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| openssh | source | wheezy | 1:6.0p1-4+deb7u5 | DLA-578-1 | ||
| openssh | source | jessie | 1:6.7p1-5+deb8u3 | DSA-3626-1 | ||
| openssh | source | (unstable) | 1:7.2p2-6 | 831902 |
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.