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TITLE:
yaSSL Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA28324

VERIFY ADVISORY:
http://secunia.com/advisories/28324/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
yaSSL Library 1.x
http://secunia.com/product/6145/

DESCRIPTION:
Luigi Auriemma has discovered some vulnerabilities in yaSSL, which
can be exploited by malicious people to cause a DoS (Denial of
Service) and to compromise an application using the library.

1) A boundary error exists within the "ProcessOldClientHello()"
method in src/handshake.cpp. This can be exploited to cause a
stack-based buffer overflow via a specially crafted SSL version 2
"Hello" packet.

Successful exploitation allows execution of arbitrary code.

2) A boundary error exists within the implementation of the input
operator for SSL "Hello" packets in src/yassl_imp.cpp.  This can be
exploited to cause a buffer overflow via a specially crafted SSL
version 3 "Hello" packet.

Successful exploitation may allow execution of arbitrary code.

3) A boundary error exists within the "HASHwithTransform::Update()"
method in taocrypt/src/hash.cpp. This can be exploited to trigger an
out-of-bounds read and crash an affected application via a specially
crafted SSL "Hello" packet.

The vulnerabilities are confirmed in version 1.7.5. Other versions
may also be affected.

SOLUTION:
Restrict access to SSL servers using yaSSL to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma.

ORIGINAL ADVISORY:
http://aluigi.altervista.org/adv/yasslick-adv.txt

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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