iDefense Security Advisory 02.23.07 - Remote exploitation of an input validation error causing an integer underflow in version 3.10 of the Mozilla Foundation's Network Security Services (NSS) may allow an attacker to cause a stack-based buffer overflow and execute arbitrary code on the affected application. The vulnerability specifically exists in code responsible for handling the client master key. While negotiating an SSLv2 session, a client can specify invalid parameters which causes an integer underflow. The resulting value is used as the amount of memory to copy into a fixed size stack buffer. As a result, a potentially exploitable stack-based buffer overflow condition occurs. iDefense has confirmed this vulnerability exists in versions 3.10 and 3.11.3 of the Mozilla Network Security Services. These libraries are used in a variety of products from multiple vendors including Sun Microsystems, Red Hat and Mozilla. Previous versions are also likely to be affected. The names 'libnss3.so' on Linux based systems or 'nss3.dll' on Windows based systems may indicate the library is being used by an application.
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