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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Subject: yaSSL Multiple Vulnerabilities
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