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TITLE:
BusyBox "unpack_Z_stream()" Buffer Underflow Vulnerability

SECUNIA ADVISORY ID:
SA45702

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45702/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45702

RELEASE DATE:
2011-08-19

DISCUSS ADVISORY:
http://secunia.com/advisories/45702/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Criticality Level
 * Impact
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 * CVE Reference(s)

http://secunia.com/advisories/45702/

ONLY AVAILABLE IN CUSTOMER AREA:
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https://ca.secunia.com/?page=viewadvisory&vuln_id=45702

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 BusyBox, which can be exploited
by malicious people to cause a DoS (Denial of Service) and
potentially compromise a user's system.

The vulnerability is caused due to a boundary error within the
"unpack_Z_stream()" function
(archival/libarchive/decompress_uncompress.c) and can be exploited to
cause a buffer underflow via a specially crafted datastream.

This is related to:
SA21427

The vulnerability is reported in version 1.18.5. Other versions may
also be affected.

SOLUTION:
Fixed in the GIT repository.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Originally reported in ncompress by Tavis Ormandy.

ORIGINAL ADVISORY:
http://git.busybox.net/busybox/diff/archival/libarchive/decompress_uncompress.c?id=251fc70e9722f931eec23a34030d05ba5f747b0e

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
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private users keeping their systems up to date against the latest
vulnerabilities.

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