2884 : OpenCA Multiple Signature Validation Bypass
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Info

Last Modified

8 months ago

Percent Complete

80%

Disclosure

Dec 01, 2003

Discovery

Unknown

Dates

Exploit

Unknown

Solution

Unknown

Description

OpenCA contains multiple flaws that may allow revoked or expired certificates to be accepted as valid. The issue is triggered because OpenCA fails to properly use the correct certificate in a chain to validate the certificate's serial. It is possible that the flaw may allow revoked/invalid keys being accepted, resulting in unauthorized access or a loss of confidentiality and/or integrity.

Classification

Location: Remote/Network Access Required
Attack Type: Cryptographic
Impact: Loss of Integrity

Technical

The vulnerabilities are caused due to errors in the regular expressions in "OpenCA::PKCS7", and in the "crypto-utils.lib" library when creating X.509 objects and when checking serials of certificates used for creating a PKCS#7 signature.

Solution

Upgrade to version 0.9.1.4 or higher, as it has been reported to fix this vulnerability. OpenCA has also released patches that address this issue.

Products

OpenCA Software Labs
Watch-list
OpenCA
Watch-list
0.9.1.3

References

Tools & Filters

Nessus

14714

Credit

Unknown or Incomplete

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