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OpenSSL 0.9.8 < 0.9.8s / 1.x < 1.0.0f Multiple Vulnerabilities

High

Synopsis

The remote web server is affected by multiple vulnerabilities.

Description

Versions of OpenSSL 0.9.8 earlier than 0.9.8s, and 1.0.0 earlier than 1.0.0f are potentially affected by the following vulnerabilities :

- An extension of the Vaudenay padding oracle attack exists against CBC mode encryption which enables an efficient plaintext recovery attack against the OpenSSL implementation of DTLS. (CVE-2011-4108)

- If x509_V_FLAG_POLICY_CHECK is set in OpenSSL 0.9.8, then a policy check failure can lead to a double-free. (CVE-2011-4109)

- OpenSSL fails to clear the bytes used as block cipher padding in SSL 3.0 records. As a result, in each record, up to 15 bytes of uninitialized memory may be sent, encrypted, to the SSL peer. (CVE-2011-4576)

- RFC 3779 data can be included in certificates, and if it is malformed, may trigger an assertion failure. This could be used in a denial-of-service attack. (CVE-2011-4577)

- Support for handshake restarts for server gated cryptography (SGC) can be used in a denial-of-service attack. (CVE-2011-4619)

- A malicious TLS client can send an invalid set of GOST parameters which will cause the server to crash due to a lack of error checking. (CVE-2012-0027)

Solution

Upgrade to OpenSSL 0.9.8s, 1.0.0f, or later.