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Debian Security Advisory DSA 2664-1 (stunnel4 - buffer overflow)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Stunnel, a program designed to work as an universal SSL tunnel for network daemons, is prone to a buffer overflow vulnerability when using the Microsoft NT LAN Manager (NTLM) authentication (protocolAuthentication = NTLM) together with the connect protocol method (protocol = connect). With these prerequisites and using stunnel4 in SSL client mode (client = yes ) on a 64 bit host, an attacker could possibly execute arbitrary code with the privileges of the stunnel process, if the attacker can either control the specified proxy server or perform man-in-the-middle attacks on the tcp session between stunnel and the proxy sever. Note that for the testing distribution (wheezy) and the unstable distribution (sid), stunnel4 is compiled with stack smashing protection enabled, which should help protect against arbitrary code execution.
Affected Software
Affected Software
stunnel4 on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For the stable distribution (squeeze), this problem has been fixed in version 3:4.29-1+squeeze1. For the testing distribution (wheezy), this problem has been fixed in version 3:4.53-1.1. For the unstable distribution (sid), this problem has been fixed in version 3:4.53-1.1. We recommend that you upgrade your stunnel4 packages.