CVE-2020-8608

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libslirp	24.10 oracular	Fixed 4.1.0-2ubuntu1
	24.04 LTS noble	Fixed 4.1.0-2ubuntu1
	23.10 mantic	Fixed 4.1.0-2ubuntu1
	23.04 lunar	Fixed 4.1.0-2ubuntu1
	22.10 kinetic	Fixed 4.1.0-2ubuntu1
	22.04 LTS jammy	Fixed 4.1.0-2ubuntu1
	21.10 impish	Fixed 4.1.0-2ubuntu1
	21.04 hirsute	Fixed 4.1.0-2ubuntu1
	20.10 groovy	Fixed 4.1.0-2ubuntu1
	20.04 LTS focal	Fixed 4.1.0-2ubuntu1
	19.10 eoan	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
qemu	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Fixed 1:4.0+dfsg-0ubuntu9.4
	18.04 LTS bionic	Fixed 1:2.11+dfsg-1ubuntu7.23
	16.04 LTS xenial	Fixed 1:2.5+dfsg-5ubuntu10.43
	14.04 LTS trusty	Needs evaluation
qemu-kvm	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	19.10 eoan	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
slirp	24.10 oracular	Vulnerable
	24.04 LTS noble	Vulnerable
	23.10 mantic	Ignored end of life, was needed
	23.04 lunar	Ignored end of life, was needed
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Vulnerable
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Vulnerable
	19.10 eoan	Ignored end of life
	18.04 LTS bionic	Fixed 1:1.0.17-8ubuntu18.04.1
	16.04 LTS xenial	Fixed 1:1.0.17-8ubuntu16.04.1
	14.04 LTS trusty	Fixed 1:1.0.17-7+deb8u2build0.14.04.1+esm1 Ubuntu Pro
slirp4netns	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Needs evaluation
	19.10 eoan	Ignored end of life
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

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Notes

mdeslaur

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

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libslirp	Upstream: 30648c0 Upstream: 68ccb80

Severity score breakdown

Parameter	Value
Base score	5.6 · Medium
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

Cvss 3 Severity Score