| Name | CVE-2020-10756 |
| Description | An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator. This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible information disclosure. This flaw affects versions of libslirp before 4.3.1. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2288-1, DSA-4728-1 |
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 | 4.7.0-1 | fixed |
| sid, trixie | 4.8.0-1 | fixed |
| qemu (PTS) | jessie, jessie (lts) | 1:2.1+dfsg-12+deb8u23 | fixed |
| stretch (security) | 1:2.8+dfsg-6+deb9u17 | fixed |
| stretch (lts), stretch | 1:2.8+dfsg-6+deb9u19 | fixed |
| buster (security), buster, buster (lts) | 1:3.1+dfsg-8+deb10u12 | fixed |
| bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u2 | fixed |
| bookworm | 1:7.2+dfsg-7+deb12u7 | fixed |
| sid, trixie | 1:9.1.1+ds-5 | fixed |
| slirp4netns (PTS) | buster | 0.2.3-1 | vulnerable |
| bullseye | 1.0.1-2 | fixed |
| bookworm | 1.2.0-1 | fixed |
| sid, trixie | 1.2.1-1 | 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) | 4.3.1-1 | | | |
| qemu | source | wheezy | (unfixed) | end-of-life | | |
| qemu | source | jessie | (not affected) | | | |
| qemu | source | stretch | 1:2.8+dfsg-6+deb9u10 | | DLA-2288-1 | |
| qemu | source | buster | 1:3.1+dfsg-8+deb10u6 | | DSA-4728-1 | |
| qemu | source | (unstable) | 1:4.1-2 | | | |
| slirp4netns | source | (unstable) | 1.0.1-1 | | | |
Notes
[buster] - slirp4netns <no-dsa> (Minor issue)
qemu 1:4.1-2 switched to system libslirp, marking that version as fixed.
slirp4netns 1.0.1-1 switched to system libslirp, marking that version as fixed.
https://bugzilla.redhat.com/show_bug.cgi?id=1835986#c11
https://github.com/rootless-containers/slirp4netns/security/advisories/GHSA-96c5-v27g-58vf
[jessie] - qemu <not-affected> (Vulnerable code introduced later)