libmspack frame_end overflow which could cause infinite loop

2015-01-02 / 2015-04-12
Credit: Jakub Wilk
Risk: Medium
Local: Yes
Remote: No
CVE: CVE-2014-9556
CWE: CWE-189


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

Hi, Jakub Wilk originally reported to the Debian BTS a problem with cabextract on a specially crafted cab file, causing cabextract to hang forever. The problem is actually in the embedded copy of libmspack, see [1]. Libmspack, a library to provide compression and decompression of some file formats used by Microsoft, is used in many project (or embedded there like also Clamav). This issue can cause a remotely exploitable denial-of-service condition due to clamav thread hanging forever while scanning the file. A patch is available at [2] for libmspack. Could you please assign a CVE for this issue in libmspack? References: [1] https://bugs.debian.org/773041 [2] http://anonscm.debian.org/cgit/collab-maint/libmspack.git/tree/debian/patches/qtmd-fix-frame_end-overflow.patch Regards, Salvatore

References:

https://bugs.debian.org/773041
http://anonscm.debian.org/cgit/collab-maint/libmspack.git/tree/debian/patches/qtmd-fix-frame_end-overflow.patch


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