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Insecure Library Loading
Highly critical

yaSSL Multiple Vulnerabilities

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Release Date:  2008-01-07    Last Update:  2008-01-29    Views:  11,464

Secunia Advisory SA28324

Where:

From remote

Impact:

DoS, System access

Solution Status:

Unpatched

CVE Reference(s):

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: yaSSL Multiple Vulnerabilities

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