Description of problem: On x86-64, a 32-bit process (TIFIA32) can switch to 64-bit mode with ljmp, and then use the "syscall" instruction to make a 64-bit system call. A 64-bit process make a 32-bit system call with int $0x80.

In both these cases, auditsyscallentry() will use the wrong system call number table and the wrong system call argument registers. This could be used to circumvent a syscall audit configuration that filters based on the syscall numbers or argument details.

References: http://scary.beasts.org/security/CESA-2009-001.html http://scary.beasts.org/security/CESA-2009-004.html https://bugzilla.redhat.com/showbug.cgi?id=487255 http://lkml.org/lkml/2009/2/27/451 summary http://lkml.org/lkml/2009/2/27/452 syscall-audit

The streamreqbodycl function in modproxyhttp.c in the modproxy module in the Apache HTTP Server before 2.3.3, when a reverse proxy is configured, does not properly handle an amount of streamed data that exceeds the Content-Length value, which allows remote attackers to cause a denial of service (CPU consumption) via crafted requests.

François Guerraz reported in Debian BTS a possible DoS (CPU consumption) a DoS with moddeflate since it does not stop to compress large files even after the network connection has been closed. This allows to use large amounts of CPU if there is a largish file available that has moddeflate enabled.

Original report: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712

Post to the apache-httpd-dev mailing list: http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2

Jakob Balle and Carsten Eiram of Secunia Research reported a race condition in NPObjWrapperNewResolve when accessing the properties of a NPObject, a wrapped JSObject. Balle and Eiram demonstrated that this condition could be reached by navigating away from a web page during the loading of a Java applet. Under such conditions the Java object would be destroyed but later called into resulting in a free memory read. An attacker could potentially write to the freed memory before it is reused and run arbitrary code on the victim's computer.