Bug 2215930 (CVE-2023-4156)

Summary:	CVE-2023-4156 gawk: heap out of bound read in builtin.c
Product:	[Other] Security Response	Reporter:	TEJ RATHI <trathi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	jamartis, lnykryn
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gawk 5.1.1	Doc Type:	If docs needed, set a value
Doc Text:	A heap out-of-bounds read flaw was found in builtin.c in the gawk package. This issue may lead to a crash and could be used to read sensitive information.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2215940, 2215941, 2215942, 2229176
Bug Blocks:	2215943

Description TEJ RATHI 2023-06-19 12:39:55 UTC

A heap out of bound read issue exists in builtin.c of gawk prior to version 5.1.1. The array "the_args" takes an unsafe index "val", while it does not validate the index to ensure the index refers to a valid position in the array (e.g., exceedingly large or negative). The vulnerability can cause crash of the software and might be used by attackers to read sensitive information.

https://mail.gnu.org/archive/html/bug-gawk/2022-08/msg00000.html
https://mail.gnu.org/archive/html/bug-gawk/2022-08/msg00023.html
https://fossies.org/linux/gawk/ChangeLog#470 (Line: 470-475)

Comment 3 TEJ RATHI 2023-06-19 12:52:24 UTC

Created gawk tracking bugs for this issue:

Affects: fedora-all [bug 2215940]