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TITLE:
Apple iOS "basicConstraints" X.509 Certificate Chain Validation
Vulnerability

SECUNIA ADVISORY ID:
SA45369

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45369/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45369

RELEASE DATE:
2011-07-27

DISCUSS ADVISORY:
http://secunia.com/advisories/45369/#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/45369/

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=45369

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 Apple iOS, which can be
exploited by malicious people to conduct spoofing attacks.

The vulnerability is caused due to an error when validating the
"basicConstraints" parameter of certificates in the certificate
chain. This can be exploited to spoof certificates of arbitrary
domains and disclose encrypted information e.g. using a
Man-in-the-Middle (MitM) attack.

SOLUTION:
Apply iOS 4.2.10 Software Update for iPhone 4 (CDMA model) or iOS
4.3.5 Software Update for iPhone 3GS and iPhone 4 (GSM), iPod touch
(3rd generation) and later, and iPad.

PROVIDED AND/OR DISCOVERED BY:
Paul Kehrer, Trustwave's SpiderLabs.

The vendor also credits Gregor Kopf, Recurity Labs on behalf of BSI.

ORIGINAL ADVISORY:
Apple:
http://support.apple.com/kb/HT4824
http://support.apple.com/kb/HT4825

Trustwave:
https://www.trustwave.com/spiderlabs/advisories/TWSL2011-007.txt

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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