Secunia Security Advisory - 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.
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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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