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CVE-2021-3592

Published: 15 June 2021

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

Notes

AuthorNote
mdeslaur
patches for this introduced a regression that was fixed in 4.6.1

Priority

Low

Cvss 3 Severity Score

3.8

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
trusty Needed

bionic
Released (1:2.11+dfsg-1ubuntu7.37)
focal Not vulnerable
(uses system libslirp)
groovy Not vulnerable
(uses system libslirp)
upstream Needs triage

hirsute Not vulnerable
(uses system libslirp)
kinetic Not vulnerable
(uses system libslirp)
lunar Not vulnerable
(uses system libslirp)
xenial Needed

impish Not vulnerable
(uses system libslirp)
jammy Not vulnerable
(uses system libslirp)
mantic Not vulnerable
(uses system libslirp)
libslirp
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (4.1.0-2ubuntu2.2)
groovy
Released (4.3.1-1ubuntu0.1)
hirsute
Released (4.4.0-1ubuntu0.1)
trusty Does not exist

upstream Needs triage

xenial Ignored
(end of standard support)
kinetic
Released (4.6.1-1)
lunar
Released (4.6.1-1)
impish
Released (4.4.0-1ubuntu0.21.10.1)
jammy
Released (4.6.1-1)
mantic
Released (4.6.1-1)
Patches:
upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e72a056ec0b2c16e0299fc5c6b94e4ca17 (v4.6.0)
upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/f13cad45b25d92760bb0ad67bec0300a4d7d5275 (v4.6.0)
upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/2eca0838eee1da96204545e22cdaed860d9d7c6c (v4.6.0)
upstream: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/c9f314f6e315a5518432761fea864196a290f799 (regression fix)

Severity score breakdown

Parameter Value
Base score 3.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N