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Debian Security Advisory DSA 1852-1 (fetchmail)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update to fetchmail announced via advisory DSA 1852-1.
Insight
Insight
It was discovered that fetchmail, a full-featured remote mail retrieval and forwarding utility, is vulnerable to the Null Prefix Attacks Against SSL/TLS Certificates recently published at the Blackhat conference. This allows an attacker to perform undetected man-in-the-middle attacks via a crafted ITU-T X.509 certificate with an injected null byte in the subjectAltName or Common Name fields. Note, as a fetchmail user you should always use strict certificate validation through either these option combinations: sslcertck ssl sslproto ssl3 (for service on SSL-wrapped ports) or sslcertck sslproto tls1 (for STARTTLS-based services) For the oldstable distribution (etch), this problem has been fixed in version 6.3.6-1etch2. For the stable distribution (lenny), this problem has been fixed in version 6.3.9~rc2-4+lenny1. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 6.3.9~rc2-6. We recommend that you upgrade your fetchmail packages.
Solution
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201852-1