Bug 1991731 (CVE-2021-38185) - 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
Summary: CVE-2021-38185 cpio: integer overflow in ds_fgetstr() in dstring.c can lead t...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-38185
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1994259 1991732 1992511 1992512 1994258
Blocks: 1991733
TreeView+ depends on / blocked
 
Reported: 2021-08-09 20:13 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 09:36 UTC (History)
13 users (show)

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.
Clone Of:
Environment:
Last Closed: 2022-05-11 19:46:24 UTC
Embargoed:


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:1991 0 None None None 2022-05-10 14:47:46 UTC

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


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