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TITLE:
Plone Web Form Hash Collision Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA47406

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47406/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47406

RELEASE DATE:
2011-12-29

DISCUSS ADVISORY:
http://secunia.com/advisories/47406/#comments

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

http://secunia.com/advisories/47406/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=47406

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
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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 Plone, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within a hash generation
function when hashing form posts and updating a hash table. This can
be exploited to cause a hash collision resulting in high CPU
consumption via a specially crafted form sent in a HTTP POST
request.

The vulnerability is reported in version 4.1.3 and prior.

SOLUTION:
Currently there is no known workaround.

PROVIDED AND/OR DISCOVERED BY:
Alexander Klink, n.runs AG and Julian Wälde, Technische Universität
Darmstadt

ORIGINAL ADVISORY:
n.runs (SA-2011.004):
http://www.nruns.com/_downloads/advisory28122011.pdf

oCERT (#2011-003):
http://www.ocert.org/advisories/ocert-2011-003.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:
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