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TITLE:
Tor "policy_summarize()" Directory Authority Denial of Service
Vulnerability

SECUNIA ADVISORY ID:
SA43548

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43548/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43548

RELEASE DATE:
2011-03-20

DISCUSS ADVISORY:
http://secunia.com/advisories/43548/#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/43548/

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=43548

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 Tor, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a boundary error within the
"policy_summarize()" function in src/or/policies.c, which can be
exploited to crash a Tor directory authority.

The vulnerability is reported in versions prior to 0.2.1.30.

SOLUTION:
Update to version 0.2.1.30.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits piebeer.

ORIGINAL ADVISORY:
https://lists.torproject.org/pipermail/tor-announce/2011-February/000000.html

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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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


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

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