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yaSSL Multiple Vulnerabilities
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Secunia Advisory:
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SA28324
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Release Date:
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2008-01-07
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Last Update:
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2008-01-29
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Popularity:
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4,030 views
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Critical:
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Highly critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Unpatched
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| Software: | yaSSL Library 1.x
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Binary Analysis:
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BA340 :: Available for 1 Credit 
BA345 :: Available for 1 Credit
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| CVE reference: | CVE-2008-0226
CVE-2008-0227
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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.
Changelog:
2008-01-15: Added CVE reference.
2008-01-29: Added CVE reference.
Original Advisory:
http://aluigi.altervista.org/adv/yasslick-adv.txt
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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