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TITLE:
Tahoe-LAFS Integrity Check Logic Error Security Issue

SECUNIA ADVISORY ID:
SA47506

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47506/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47506

RELEASE DATE:
2012-01-13

DISCUSS ADVISORY:
http://secunia.com/advisories/47506/#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/47506/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
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 * Systems Affected
 * Approve Distribution
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https://ca.secunia.com/?page=viewadvisory&vuln_id=47506

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 security issue has been reported in Tahoe-LAFS, which can be
exploited by malicious people to manipulate certain data.

The security issue is caused due to a logic error within the
integrity checking of the mutable downloader, which can be exploited
to deliver manipulated shares to a client without triggering an
integrity failure.

Successful exploitation requires that the attacker is able to provide
multiple shares in a certain order to a client (e.g. controls one or
more storage servers).

The security issue is reported in version 1.9.0.

SOLUTION:
Update to version 1.9.1.

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

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor (Kevan Carstensen).

ORIGINAL ADVISORY:
https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1654
https://tahoe-lafs.org/pipermail/tahoe-announce/2012-January/000033.html

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:
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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Definitions: (Criticality, Where etc.)
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Please Note:
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Secunia NEVER sends attached files with advisories.
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