FreeBSD Security Advisory (FreeBSD-SA-03:18.openssl.asc)

Published: 2008-09-04 18:41:11

CVSS Base Vector:
AV:N/AC:L/Au:N/C:C/I:C/A:C

Technical Details:
FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial- grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. This advisory addresses four separate flaws recently fixed in OpenSSL. The flaws are described in the following excerpt from the OpenSSL.org advisory (see references): 1. Certain ASN.1 encodings that are rejected as invalid by the parser can trigger a bug in the deallocation of the corresponding data structure, corrupting the stack. This can be used as a denial of service attack. It is currently unknown whether this can be exploited to run malicious code. This issue does not affect OpenSSL 0.9.6. 2. Unusual ASN.1 tag values can cause an out of bounds read under certain circumstances, resulting in a denial of service vulnerability. 3. A malformed public key in a certificate will crash the verify code if it is set to ignore public key decoding errors. Public key decode errors are not normally ignored, except for debugging purposes, so this is unlikely to affect production code. Exploitation of an affected application would result in a denial of service vulnerability. 4. Due to an error in the SSL/TLS protocol handling, a server will parse a client certificate when one is not specifically requested. This by itself is not strictly speaking a vulnerability but it does mean that *all* SSL/TLS servers that use OpenSSL can be attacked using vulnerabilities 1, 2 and 3 even if they don't enable client authentication.

Recommendations:
Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-03:18.openssl.asc

Summary:
The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-03:18.openssl.asc

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

Severity
High
CVSS Score
10.0
Published
2008-09-04
Modified
2017-12-07
Category
FreeBSD Local Security Checks

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