| Name | CVE-2021-3595 |
| Description | An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2753-1, DLA-3362-1 |
| Debian Bugs | 989996 |
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 |
| trixie | 4.8.0-1 | fixed |
| forky, sid | 4.9.1-1 | fixed |
| qemu (PTS) | bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u5 | fixed |
| bookworm | 1:7.2+dfsg-7+deb12u16 | fixed |
| bookworm (security) | 1:7.2+dfsg-7+deb12u15 | fixed |
| trixie | 1:10.0.3+ds-0+deb13u1 | fixed |
| trixie (security) | 1:10.0.2+ds-2+deb13u1 | fixed |
| forky, sid | 1:10.1.2+ds-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e72a056ec0b2c16e0299fc5c6b94e4ca17 (v4.6.0)
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/3f17948137155f025f7809fdc38576d5d2451c3d (v4.6.0)
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/990163cf3ac86b7875559f49602c4d76f46f6f30 (v4.6.0)
qemu 1:4.1-2 switched to system libslirp, marking that version as fixed.