| Name | CVE-2021-28041 |
| Description | ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 984940 |
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 | (unstable) | 1:8.4p1-5 | | | 984940 |
Notes
[buster] - openssh <not-affected> (Vulnerable code introduced later)
[stretch] - openssh <not-affected> (Vulnerable code introduced later)
https://www.openwall.com/lists/oss-security/2021/03/03/1
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db
https://ftp.openbsd.org/pub/OpenBSD/patches/6.8/common/015_sshagent.patch.sig
[jessie] - openssh <not-affected> (Vulnerable code introduced later)