| Name | CVE-2019-16905 |
| Description | OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH. |
| 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 | fixed |
| stretch (security) | 1:7.4p1-10+deb9u6 | fixed |
| stretch (lts), stretch | 1:7.4p1-10+deb9u9 | fixed |
| buster | 1:7.9p1-10+deb10u2 | vulnerable |
| buster (security) | 1:7.9p1-10+deb10u4 | vulnerable |
| bullseye (security), bullseye | 1:8.4p1-5+deb11u3 | fixed |
| bookworm (security), bookworm | 1:9.2p1-2+deb12u2 | fixed |
| trixie | 1:9.6p1-4 | fixed |
| sid | 1:9.7p1-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| openssh | source | jessie | (not affected) | | | |
| openssh | source | stretch | (not affected) | | | |
| openssh | source | (unstable) | 1:8.1p1-1 | unimportant | | |
Notes
[stretch] - openssh <not-affected> (Vulnerable code introduced later)
[jessie] - openssh <not-affected> (Vulnerable code introduced later)
Issue in experimental (and not enabled) XMSS implementation; futhermore there
is not supported way to enable it when building openssh.