Bug 1340099 – CVE-2016-5034 libdwarf: Out-of-bounds write in dwarf_elf_access.c

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Bug 1340099 - (CVE-2016-5034) CVE-2016-5034 libdwarf: Out-of-bounds write in dwarf_elf_access.c

Summary:	CVE-2016-5034 libdwarf: Out-of-bounds write in dwarf_elf_access.c

Status:	NEW

Aliases:	CVE-2016-5034

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=low,public=20160517,reported=2...
Keywords:	Security

Depends On:	1340129 1340128
Blocks:
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Reported:	2016-05-26 08:47 EDT by Andrej Nemec
Modified:	2016-05-26 09:48 EDT (History)
CC List:	2 users (show)

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Description Andrej Nemec 2016-05-26 08:47:58 EDT

An out-of-bounds write was found in libdwarf. Test object shows an invalid write in dwarf_elf_access.c (when doing the relocations). Adding the relocation value to anything overflowed and disguised the bad relocation record. With a 32bit kernel build the test could show a double-free and coredump due to the unchecked invalid writes from relocations.

References:

http://seclists.org/oss-sec/2016/q2/393

External references:

https://www.prevanders.net/dwarfbug.html

Upstream fix:

https://sourceforge.net/p/libdwarf/code/ci/10ca310f64368dc083efacac87732c02ef560a92

Comment 1 Andrej Nemec 2016-05-26 09:42:27 EDT

Created libdwarf tracking bugs for this issue:

Affects: fedora-all [bug 1340128]
Affects: epel-6 [bug 1340129]

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