Bug 1991731 (CVE-2021-38185)

Summary:	CVE-2021-38185 cpio: integer overflow in ds_fgetstr() in dstring.c can lead to an out-of-bounds write via a crafted pattern file
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bdettelb, caswilli, databases-maint, fcanogab, fjansen, kaycoth, kdudka, ovasik, panovotn, pkubat, praiskup, scorneli, tomckay
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in cpio. An integer overflow that triggers an out-of-bounds heap write can allow an attacker to execute arbitrary code via a crafted pattern file. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-11 19:46:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1994259, 1991732, 1992511, 1992512, 1994258
Bug Blocks:	1991733

Description Guilherme de Almeida Suckevicz 2021-08-09 20:13:00 UTC

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.

References:
https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.html
https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.html

Upstream patch:
https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061b

Comment 1 Guilherme de Almeida Suckevicz 2021-08-09 20:13:16 UTC

Created cpio tracking bugs for this issue:

Affects: fedora-all [bug 1991732]

Comment 16 errata-xmlrpc 2022-05-10 14:47:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1991 https://access.redhat.com/errata/RHSA-2022:1991

Comment 17 Product Security DevOps Team 2022-05-11 19:46:22 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-38185