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CVE-2020-8608

Published: 6 February 2020

In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c misuses snprintf return values, leading to a buffer overflow in later code.

From the Ubuntu Security Team

It was discovered that the SLiRP networking implementation of the QEMU emulator misuses snprintf return values. An attacker could use this to cause a denial of service (application crash) or potentially execute arbitrary code.

Notes

AuthorNote
mdeslaur
possible better approach would be to disable tcp_emu completely
https://gitlab.freedesktop.org/slirp/libslirp/commit/07c2a44b67e219ac14207f7a1b33704e1312cf91

Priority

Medium

Cvss 3 Severity Score

5.6

Score breakdown

Status

Package Release Status
libslirp
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal
Released (4.1.0-2ubuntu1)
groovy
Released (4.1.0-2ubuntu1)
hirsute
Released (4.1.0-2ubuntu1)
impish
Released (4.1.0-2ubuntu1)
jammy
Released (4.1.0-2ubuntu1)
kinetic
Released (4.1.0-2ubuntu1)
lunar
Released (4.1.0-2ubuntu1)
mantic
Released (4.1.0-2ubuntu1)
trusty Does not exist

upstream Needs triage

xenial Does not exist

Patches:
upstream: https://gitlab.freedesktop.org/slirp/libslirp/commit/30648c03b27fb8d9611b723184216cd3174b6775
upstream: https://gitlab.freedesktop.org/slirp/libslirp/commit/68ccb8021a838066f0951d4b2817eb6b6f10a843
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.23)
eoan
Released (1:4.0+dfsg-0ubuntu9.4)
focal Not vulnerable
(uses system libslirp)
groovy Not vulnerable
(uses system libslirp)
hirsute Not vulnerable
(uses system libslirp)
impish Not vulnerable
(uses system libslirp)
jammy Not vulnerable
(uses system libslirp)
kinetic Not vulnerable
(uses system libslirp)
lunar Not vulnerable
(uses system libslirp)
mantic Not vulnerable
(uses system libslirp)
trusty Needs triage

upstream Needs triage

xenial
Released (1:2.5+dfsg-5ubuntu10.43)
qemu-kvm
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

slirp
Launchpad, Ubuntu, Debian
bionic
Released (1:1.0.17-8ubuntu18.04.1)
eoan Ignored
(end of life)
focal Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Ignored
(end of life, was needed)
mantic Needed

trusty
Released (1:1.0.17-7+deb8u2build0.14.04.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (1:1.0.17-8ubuntu16.04.1)
slirp4netns
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Ignored
(end of life)
focal Needs triage

groovy Not vulnerable
(1.0.1-1)
hirsute Not vulnerable
(1.0.1-1)
impish Not vulnerable
(1.0.1-1)
jammy Not vulnerable
(1.0.1-1)
kinetic Not vulnerable
(1.0.1-1)
lunar Not vulnerable
(1.0.1-1)
mantic Not vulnerable
(1.0.1-1)
trusty Does not exist

upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 5.6
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L