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TITLE:
Tahoe-LAFS Cancellation Secret Disclosure Share Deletion
Vulnerability

SECUNIA ADVISORY ID:
SA45881

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45881/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45881

RELEASE DATE:
2011-09-16

DISCUSS ADVISORY:
http://secunia.com/advisories/45881/#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/45881/

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=45881

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 Tahoe-LAFS, which can be
exploited by malicious people to manipulate certain data.

The vulnerability is caused due to Tahoe-LAFS not properly preventing
clients from reading past the end of share data, which can be used to
gain knowledge of the cancellation secret. This can be exploited to
delete shares from the server by e.g. calling the
"remote_cancel_lease()" function.

The vulnerability is reported in versions 1.3.0 through 1.8.2.

SOLUTION:
Update to version 1.8.3.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://tahoe-lafs.org/pipermail/tahoe-dev/2011-September/006675.html
http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1528

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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
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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.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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