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Vigil@nce - Perl IO-Socket-SSL: unchecked certificate

December 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

When an application uses the Perl IO::Socket::SSL module, the
SSL_verify_mode option is not honored, so the remote certificate
is not checked.

Severity: 2/4

Creation date: 06/12/2010

DESCRIPTION OF THE VULNERABILITY

The Perl IO::Socket::SSL module creates SSL sockets.

The SSL_verify_mode option indicates how to check the remote
certificate :
 0x0 : no check
 0x1 : check
 0x2 : require a client certificate
 etc.

However, this option is not used. If the application using Perl
IO::Socket::SSL sets a non null value, it is thus ignored.

When an application uses the Perl IO::Socket::SSL module, the
SSL_verify_mode option is not honored, so the remote certificate
is not checked.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Perl-IO-Socket-SSL-unchecked-certificate-10179


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