|Summary:||Specially crafted binary can cause readelf to read from an arbitrary address-|
|Product:||Red Hat Enterprise Linux 7||Reporter:||Jeff Law <law>|
|Component:||binutils||Assignee:||Nick Clifton <nickc>|
|Status:||CLOSED ERRATA||QA Contact:||Miloš Prchlík <mprchlik>|
|Version:||7.2||CC:||law, mcermak, mnewsome, mpolacek, mprchlik, nickc, ohudlick|
|Fixed In Version:||Doc Type:||Bug Fix|
Cause: There was code in the readelf program would assume that the binary being examined was well behaved, and followed the ELF specification correctly. Consequence: Using a specially crafted binary image, that did not quite conform to the ELF specification would allow an attacker to force the readelf program to attempt to read from an attacker specified address. Fix: Add code to readelf to verify conformation to the ELF standard before attempting to read the required data. Result: Readelf can no longer be tricked into reading from an arbitrary address.
|Last Closed:||2016-11-04 01:53:03 UTC||Type:||Bug|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Cloudforms Team:||---||Target Upstream Version:|
|Bug Depends On:||1260034, 1260035, 1409817|
|Bug Blocks:||1297579, 1313485|
Description Jeff Law 2015-09-04 15:18:16 UTC
+++ This bug was initially created as a clone of Bug #1260035 +++ +++ This bug was initially created as a clone of Bug #1260034 +++ [ Creating a clone for RHEL 7 as well. ] Description of problem: Readelf can be fooled into attempting to read from an arbitrary memory location if it is run against a specially crafted binary. Version-Release number of selected component (if applicable): All versions. How reproducible: Run "readelf -a test00-min' Actual results: seg-fault Expected results: error message Additional info: The bug has been fixed in the upstream FSF sources. The patch can be found here: https://sourceware.org/bugzilla/show_bug.cgi?id=18879
Comment 1 Nick Clifton 2016-02-09 14:46:59 UTC
Created attachment 1122435 [details] Patch to harden readelf against this type of corrupt binary This is the patch needed to fix this problem.
Comment 2 Nick Clifton 2016-02-15 17:25:57 UTC
Patch checked in. Moved to MODIFIED
Comment 4 Miloš Prchlík 2016-06-24 07:44:37 UTC
Verified for build binutils-2.25.1-19.base.el7.
Comment 8 errata-xmlrpc 2016-11-04 01:53:03 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-2016-2265.html