Bug 1906782 (CVE-2020-16590)

Summary:	CVE-2020-16590 binutils: double free vulnerability in process_symbol_table could result in DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adscvr, ailan, aoliva, dvlasenk, elima, erik-fedora, fidencio, fweimer, jakub, klember, ktietz, law, manisandro, marcandre.lureau, mcermak, mnewsome, mpolacek, mprchlik, nickc, ohudlick, rjones, sipoyare, virt-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	binutils 2.35	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-12-23 00:27:55 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:	1906783, 1906784
Bug Blocks:	1906786

Description Michael Kaplan 2020-12-11 11:57:23 UTC

A double free vulnerability exists in the Binary File Descriptor (BFD) (aka libbrd) in GNU Binutils 2.34 in the process_symbol_table, as demonstrated in readelf, via a crafted file.

External References:

https://sourceware.org/bugzilla/show_bug.cgi?id=25821
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c98a4545dc7bf2bcaf1de539c4eb84784680eaa4

Comment 1 Michael Kaplan 2020-12-11 11:58:23 UTC

Created binutils tracking bugs for this issue:

Affects: fedora-32 [bug 1906783]


Created mingw-binutils tracking bugs for this issue:

Affects: fedora-all [bug 1906784]

Comment 3 Todd Cullum 2020-12-21 23:49:10 UTC

Flaw summary:

This flaw is a simple typo where `chains` is free()'d but `bucket` is accidentally set to NULL instead of chains. Since chains is not set to NULL, this can result in a double-free. It doesn't exist in the code we ship in 2.30 or 2.35 and thus is not affected.

Comment 4 Todd Cullum 2020-12-22 20:09:16 UTC

Statement:

binutils as shipped in Red Hat Developer Toolsets 9 and 10, Red Hat Enterprise Linux 8 BaseOS and GCC Toolsets 9 and 10, are all not affected by this flaw as it was introduced in a newer version of binutils code than shipped for BaseOS and the 9 toolsets, but already patched in the versions shipped with 10 toolsets.

Comment 5 Product Security DevOps Team 2020-12-23 00:27:55 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-2020-16590