Bug 1178725 – CVE-2014-9482 libdwarf: use-after-free when parsing a crafted ELF file

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Bug 1178725 - (CVE-2014-9482) CVE-2014-9482 libdwarf: use-after-free when parsing a crafted ELF file

Summary:	CVE-2014-9482 libdwarf: use-after-free when parsing a crafted ELF file

Status:	CLOSED WONTFIX

Aliases:	CVE-2014-9482

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

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=low,public=20141230,reported=2...
Keywords:	Security

Depends On:	1177758
Blocks:	1225848
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Reported:	2015-01-05 07:09 EST by Vasyl Kaigorodov
Modified:	2015-06-18 14:46 EDT (History)
CC List:	4 users (show)

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Doc Type:	Bug Fix
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Last Closed:	2015-06-18 14:46:19 EDT
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Description Vasyl Kaigorodov 2015-01-05 07:09:52 EST

Use-after-free vulnerability was reported in libdwarf [1].
If dwarfdump is passed a corrupted ELF file, 'Dwarf_Debug' object will be freed in 'dwarf_elf_object_access_finish', but then this object is being referenced later in 'print_error':

--------------------------------
res = dwarf_object_init(binary_interface, errhand, errarg,
        ret_dbg, error);
    if (res != DW_DLV_OK){
        dwarf_elf_object_access_finish(binary_interface);
    }
--------------------------------
...
--------------------------
    if (obj->object) {
        dwarf_elf_object_access_internals_t *internals =
            (dwarf_elf_object_access_internals_t *)obj->object;
--------------------------

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1177758

Comment 1 Martin Prpič 2015-01-06 04:20:10 EST

MITRE assigned CVE-2014-9482 to this issue: http://seclists.org/oss-sec/2015/q1/20

Comment 2 Orion Poplawski 2015-01-23 23:06:28 EST

It appears to me that the EPEL6 version - 20140413 - is vulnerable to this as well.  I believe that upstream commit 9a2dfcfe020314672086e44bddd81c155cba2a6d is the primary fix for this, but it does not apply cleanly to 20140413.

I don't want to update to the latest release due to apparent ABI incompatibilities - see http://upstream.rosalinux.ru/versions/libdwarf.html

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