| Name | CVE-2024-6387 |
| Description | A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5724-1 |
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 (security), buster, buster (lts) | 1:7.9p1-10+deb10u4 | fixed |
| bullseye (security), bullseye | 1:8.4p1-5+deb11u3 | fixed |
| bookworm (security), bookworm | 1:9.2p1-2+deb12u3 | fixed |
| sid, trixie | 1:9.9p1-3 | 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 | buster | (not affected) | | | |
| openssh | source | bullseye | (not affected) | | | |
| openssh | source | bookworm | 1:9.2p1-2+deb12u3 | | DSA-5724-1 | |
| openssh | source | (unstable) | 1:9.7p1-7 | | | |
Notes
[bullseye] - openssh <not-affected> (Vulnerable code introduced later)
Introduced with: https://github.com/openssh/openssh-portable/commit/752250caabda3dd24635503c4cd689b32a650794 (V_8_5_P1)
Fixed by: https://github.com/openssh/openssh-portable/commit/81c1099d22b81ebfd20a334ce986c4f753b0db29 (V_9_8_P1)
https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html
https://www.openwall.com/lists/oss-security/2024/07/01/1
https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt
[buster] - openssh <not-affected> (Vulnerable code introduced later)
[stretch] - openssh <not-affected> (Vulnerable code introduced later)
[jessie] - openssh <not-affected> (Vulnerable code introduced later)