CVE-2021-38185

Publication date 8 August 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

GNU cpio through 2.13 allows attackers to execute arbitrary code via a crafted pattern file, because of a dstring.c ds_fgetstr integer overflow that triggers an out-of-bounds heap write. NOTE: it is unclear whether there are common cases where the pattern file, associated with the -E option, is untrusted data.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
cpio	23.04 lunar	Fixed 2.13+dfsg-4ubuntu4
	22.10 kinetic	Fixed 2.13+dfsg-4ubuntu4
	22.04 LTS jammy	Fixed 2.13+dfsg-4ubuntu4
	21.10 impish	Fixed 2.13+dfsg-4ubuntu4
	21.04 hirsute	Fixed 2.13+dfsg-4ubuntu0.3
	20.04 LTS focal	Fixed 2.13+dfsg-2ubuntu0.3
	18.04 LTS bionic	Fixed 2.12+dfsg-6ubuntu0.18.04.4
	16.04 LTS xenial	Fixed 2.11+dfsg-5ubuntu1.1+esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 2.11+dfsg-1ubuntu1.2+esm2 Ubuntu Pro

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Notes

mdeslaur

second commit fixes a regression. There seems to still be a regression even with the second commit as it is causing the kernel to FTBFS. Also see debian bugs for regressions. the third commit likely fixes the kernel regressions

Patch details

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

Package	Patch details
cpio	Upstream: ?id=dd9 Upstream: ?id=dfc Upstream: ?id=236

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5064-1
GNU cpio vulnerability
8 September 2021

USN-5064-2
GNU cpio vulnerability
27 January 2022

USN-5064-3
GNU cpio vulnerability
3 August 2023