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Vulnerability Assessment & Network Security Forums |
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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery. Home >> Browse Vulnerability Assessment Database >> Ubuntu Local Security Checks >> USN170-1 : gnupg vulnerability Vulnerability Assessment Details
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USN170-1 : gnupg vulnerability |
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gnupg vulnerability Detailed Explanation for this Vulnerability Assessment Summary : The remote package "gnupg" is missing a security patch. Description : Serge Mister and Robert Zuccherato discovered a weakness of the symmetrical encryption algorithm of gnupg. When decrypting a message, gnupg uses a feature called "quick scan" this can quickly check whether the key that is used for decryption is (probably) the right one, so that wrong keys can be acertaind quickly without decrypting the whole message. A failure of the quick scan will be acertaind much faster than a successful one. Mister/Zuccherato demonstrated that this timing difference can be exploited to an attack which permits a possible hacker to decrypt parts of an encrypted message if an "oracle" is available, i. e. an automatic system that receives random encrypted messages from the attacker and answers whether it passes the quick scan check. However, since the attack requires a huge amount of oracle answers (about 32.000 for every 16 bytes of ciphertext), this attack is mostly theoretical. It does not have any impact on human operation of gnupg and is not believed to be exploitable in practice. The [...] Solution : Upgrade to : - gnupg-1.2.5-3ubuntu5.1 (Ubuntu 5.04) Network Security Threat Level: High Networks Security ID: Vulnerability Assessment Copyright: Ubuntu Security Notice (C) 2005 Canonical, Inc. / NASL script (C) 2005 Michel Arboi |
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