stunnel -- Remote Code Execution

Description:

Michal Trojnara reports:

64-bit versions of stunnel with the following conditions: * NTLM authentication enabled * CONNECT protocol negotiation enabled * Configured in SSL client mode * An attacker that can either control the proxy server specified in the "connect" option or execute MITM attacks on the TCP session between stunnel and the proxy

Can be exploited for remote code execution. The code is executed within the configured chroot directory, with privileges of the configured user and group.

References:

• CVE name CVE-2013-1762
• URL: <https://www.stunnel.org/CVE-2013-1762.html>

Affects:

• stunnel >=4.21 <4.55

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