Bug 1664700 (CVE-2018-20623)

Summary:	CVE-2018-20623 binutils: Use-after-free in the error function
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, dbaker, erik-fedora, fweimer, jokerman, kanderso, klember, mcermak, mnewsome, mpolacek, nickc, ohudlick, rjones, sthangav, trankin, virt-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 03:21:10 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1664713, 1664714, 1664715, 1668405, 1668406, 1668407
Bug Blocks:	1664716

Description Andrej Nemec 2019-01-09 13:36:06 UTC

A use-after-free issues was found in the error function of binutils. A local attacker could use this for a denial of service.

Upstream issue:

https://sourceware.org/bugzilla/show_bug.cgi?id=24049

Comment 1 Andrej Nemec 2019-01-09 13:48:13 UTC

Created binutils tracking bugs for this issue:

Affects: fedora-all [bug 1664713]


Created mingw-binutils tracking bugs for this issue:

Affects: epel-all [bug 1664715]
Affects: fedora-all [bug 1664714]

Comment 2 Riccardo Schirone 2019-01-22 16:27:56 UTC

Upstream patch:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=28e817cc440bce73691c03e01860089a0954a837

Comment 3 Riccardo Schirone 2019-01-22 16:30:35 UTC

Function readelf.c:process_archive() uses filedata->file_name when printing errors, however until the file_name field is not properly initialized, it should not be accessed, otherwise it would access memory that is freed at the previous iteration.

Comment 5 Riccardo Schirone 2019-01-22 16:45:38 UTC

The flaw was introduced with commit https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=dda8d76d0dd2b07df769f6cae20aff483468b342, thus RHEL 5, 6, 7 and Red Hat Developer Toolset 7 are not affected by this flaw.

Comment 7 Riccardo Schirone 2019-01-23 08:47:35 UTC

Statement:

This issue did not affect the versions of binutils as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include the vulnerable code, which was introduced in a newer version of the package.