| Name | CVE-2020-29129 |
| Description | ncsi.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of header data even if that exceeds the total packet length. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libslirp (PTS) | bullseye | 4.4.0-1+deb11u2 | fixed |
| bookworm, sid | 4.7.0-1 | fixed |
| qemu (PTS) | stretch | 1:2.8+dfsg-6+deb9u9 | fixed |
| stretch (security) | 1:2.8+dfsg-6+deb9u17 | fixed |
| buster, buster (security) | 1:3.1+dfsg-8+deb10u8 | vulnerable |
| bullseye | 1:5.2+dfsg-11+deb11u1 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u2 | fixed |
| bookworm, sid | 1:7.0+dfsg-7 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libslirp | source | (unstable) | 4.4.0-1 | | | |
| qemu | source | stretch | (not affected) | | | |
| qemu | source | (unstable) | 1:4.1-2 | | | |
Notes
[buster] - qemu <postponed> (Fix along in future DSA)
[stretch] - qemu <not-affected> (Vulnerable code introduced later)
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/2e1dcbc0c2af64fcb17009eaf2ceedd81be2b27f (v4.4.0)
qemu 1:4.1-2 switched to system libslirp, marking that version as fixed.
NC-SI introduced in: https://git.qemu.org/?p=qemu.git;a=commit;h=47bb83cad45eb7ce194a8ffd18f73c98edb46aec (QEMU v2.10)
https://github.com/rootless-containers/slirp4netns/security/advisories/GHSA-2j37-w439-87q3