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Bug 1409817

Summary:	Specially crafted binary can cause readelf to read from an arbitrary address-
Product:	Red Hat Enterprise Linux 6	Reporter:	Miloš Prchlík <mprchlik>
Component:	binutils	Assignee:	Nick Clifton <nickc>
Status:	CLOSED ERRATA	QA Contact:	Miloš Prchlík <mprchlik>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	6.9	CC:	law, mcermak, mnewsome, mpolacek, mprchlik, nickc, ohudlick
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Cause: The readelf program assumed that it has been given a valid ELF input file to examine, and it did not check that this assumption was correct. Consequence: Passing a specially crafted, corrupt ELF file to readelf could cause it to attempt to read from address 0, resulting in readelf being terminated with a seg-fault error. Fix: Patch the readelf sources to add checks on the validity of the ELF section headers. Result: Readelf runs correctly, does not seg-fault and is able to display information on the corrupt input file.	Story Points:	---
Clone Of:	1260034	Environment:
Last Closed:	2017-03-21 10:32:15 UTC	Type:	Bug
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:	1260034
Bug Blocks:	1260035, 1260158

Comment 2 Nick Clifton 2017-01-05 11:16:20 UTC

I have checked in an alternative patch to fix this BZ.

The problem is that the patch for PR 18879 does not work with the RHEL 6.9
binutils sources, since this version of readelf does not actually have the
capability to dump unwind information.  In theory this should mean that the
bug fixed in PR 18879 is never encountered and so no patch is needed.  In
practice however it turns out that the test case for PR 18879 triggers a
*different* bug in the 6.9 binutils, and so a patch is needed after all.

Comment 4 Miloš Prchlík 2017-01-21 18:35:54 UTC

Verified with build binutils-2.20.51.0.2-5.46.el6.

Comment 6 errata-xmlrpc 2017-03-21 10:32:15 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0677.html