CVE-2021-3593

Published: 15 June 2021

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' 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.

Priority

Low

CVSS 3 base score: 3.8

Status

Package Release Status
libslirp
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.04 (Hirsute Hippo)
Released (4.4.0-1ubuntu0.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (4.1.0-2ubuntu2.2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(out of standard support)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Patches:
Upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e72a056ec0b2c16e0299fc5c6b94e4ca17 (v4.6.0)
Upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/de71c15de66ba9350bf62c45b05f8fbff166517b (v4.6.0)
qemu
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(uses system libslirp)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(uses system libslirp)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1:2.11+dfsg-1ubuntu7.37)
Ubuntu 16.04 ESM (Xenial Xerus) Needs triage

Ubuntu 14.04 ESM (Trusty Tahr) Needs triage