Full Disclosure mailing list archives
Problems with syscall filtering technologies on Linux
From: Chris Evans <scarybeasts () gmail com>
Date: Fri, 23 Jan 2009 13:42:03 -0800
Hi, There's a trick which may permit the bypassing of policies in technologies which do syscall filtering on the Linux x86_64 kernel. The trick is made possible by the fact that the 32-bit and 64-bit kernel tables are different, combined with the fact that a 64-bit process can make a 32-bit syscall and visa versa. The syscall "number" check can get confused and permit a syscall it did not intend to. Advisory: http://scary.beasts.org/security/CESA-2009-001.html Blog post: http://scarybeastsecurity.blogspot.com/2009/01/bypassing-syscall-filtering.html Cheers Chris _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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- Problems with syscall filtering technologies on Linux Chris Evans (Jan 23)