| Name | CVE-2008-4109 |
| Description | A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | CVE-2006-5051, DSA-1638-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| openssh (PTS) | buster | 1:7.9p1-10+deb10u2 | fixed |
| buster (security) | 1:7.9p1-10+deb10u4 | fixed |
| bullseye (security), bullseye | 1:8.4p1-5+deb11u3 | fixed |
| bookworm, bookworm (security) | 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 | etch | 1:4.3p2-9etch3 | | DSA-1638-1 | |
| openssh | source | (unstable) | 1:4.6p1-1 | low | | |
Notes
The patch backported for CVE-2006-5051 was incorrect and did not
fully address the issue. The upstream fix in 4.4p1 was
right, and it the next unstable upload after that was 4.6p1.