full-disclosure - OpenSSL - dynamically linked binaries?

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Message-ID: <405F0F0E.7080402@vulnscan.org>
From: syzop at vulnscan.org (Bram Matthys (Syzop))
Subject: OpenSSL - dynamically linked binaries?

Honza Vlach wrote:
> I have checked apache mod_ssl and php module, which are both dynamically
> linked to the libssl.so.0.9.7. The thing, that confuses me lot is, when I
> look on the phpinfo(), it says "OpenSSL version 0.9.7c", which it
> was compiled against. 
> 
> Does this mean, that I'm still vulnerable, or it is just version
> hardcoded to the binary, while the library itself was sucessfully
> reloaded?

The latter...
The thing is that OPENSSL_VERSION_TEXT is used to display the
openssl version (AFAIK there's no alternative method):
     php_info_print_table_row(2, "OpenSSL Version", OPENSSL_VERSION_TEXT);

OPENSSL_VERSION_TEXT is defined in one of the openssl header files
(opensslv.h) and is a string constant, thus compiled in.

So if ldd shows it's using that lib (you could even lsof it at runtime
to be sure) then you should be ok.

	Bram Matthys.