Bug 1340116 – CVE-2016-5044 libdwarf: Heap-based buffer overflow in update_entry()

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Bug 1340116 - (CVE-2016-5044) CVE-2016-5044 libdwarf: Heap-based buffer overflow in update_entry()

Summary:	CVE-2016-5044 libdwarf: Heap-based buffer overflow in update_entry()

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-5044

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=20160504,reported=2...
Keywords:	Security

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Reported:	2016-05-26 09:23 EDT by Andrej Nemec
Modified:	2016-05-26 09:42 EDT (History)
CC List:	2 users (show)

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Last Closed:	2016-05-26 09:42:32 EDT
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Description Andrej Nemec 2016-05-26 09:23:02 EDT

A vulnerability was found in libdwarf in dwarf_elf_access.c:1071. A crafted ELF file may lead to a large offset value, which bigger than the size of target_section heap chunk, then this WRITE_UNALIGNED() function will write the value of &outval out of the heap chunk. offset is a 64bit unsigned int value, so this is more than a heap overflow bug, but also a Out-of-Bound write bug. So WRITE_UNALIGNED() need more strictly checking to prevent this. 

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/98a3da1e8237fe0d45b67ef77f3fa5ed9ff0215f

Comment 1 Tom Hughes 2016-05-26 09:29:35 EDT

Already fixed in Fedora.

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