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TITLE:
Squid DNS Replies Invalid Free Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA46609

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46609/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46609

RELEASE DATE:
2011-11-01

DISCUSS ADVISORY:
http://secunia.com/advisories/46609/#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/46609/

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=46609

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

The vulnerability is caused due to an error when processing certain
DNS replies, which can be exploited to trigger an invalid free via
e.g. DNS replies containing a CNAME record pointing to another CNAME
record pointing to an empty A record.

The vulnerability is reported in versions prior to 3.1.16.

SOLUTION:
Update to version 3.1.16.

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

PROVIDED AND/OR DISCOVERED BY:
Reported in a Squid bug by M.A.Young.

ORIGINAL ADVISORY:
Squid Bug #3237:
http://bugs.squid-cache.org/show_bug.cgi?id=3237

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:
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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
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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