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"From 2007 to 2009 vulnerabilities in a typical end-user PC almost doubled from about 220 to 420."

Non-Microsoft software to blame for increase in vulnerabilities affecting typical Windows end-users, read more:

http://secunia.com/gfx/pdf/Secunia_Half_Year_Report_2010.pdf


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TITLE:
libmspack MS-ZIP Infinite Loop Denial of Service

SECUNIA ADVISORY ID:
SA40719

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/40719/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=40719

RELEASE DATE:
2010-07-27

DISCUSS ADVISORY:
http://secunia.com/advisories/40719/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/40719/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=40719

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in libmspack, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error when copying data from an
uncompressed block (block type 0) and can be exploited to trigger an
infinite loop by tricking an application using the library into
processing specially crafted MS-ZIP archives.

The vulnerability is reported in versions prior to 0.2.

Note: An issue within the Quantum archive decoder reported by Larry
Frieson can cause the library to pass a negative integer to the
application's "spack_system::write()" implementation, which may in
turn handle this as unsigned integer, subsequently leading to e.g.
crashes.

SOLUTION:
Update to libmspack 0.2.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Jason He.

ORIGINAL ADVISORY:
http://freshmeat.net/projects/libmspack/releases/319820

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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