From af55da1e9c1a6a352b24823a8f7062c288ffbbc0 Mon Sep 17 00:00:00 2001 From: Mike DePaulo Date: Sun, 8 Feb 2015 19:15:20 -0500 Subject: LZW decompress: fix for CVE-2011-2895 From xorg/lib/Xfont commit d11ee5886e9d9ec610051a206b135a4cdc1e09a0 Specially crafted LZW stream can crash an application using libXfont that is used to open untrusted font files. With X server, this may allow privilege escalation when exploited --- nx-X11/lib/font/fontfile/decompress.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/nx-X11/lib/font/fontfile/decompress.c b/nx-X11/lib/font/fontfile/decompress.c index a4c546871..553b31585 100644 --- a/nx-X11/lib/font/fontfile/decompress.c +++ b/nx-X11/lib/font/fontfile/decompress.c @@ -261,6 +261,8 @@ BufCompressedFill (BufFilePtr f) */ while ( code >= 256 ) { + if (stackp - de_stack >= STACK_SIZE - 1) + return BUFFILEEOF; *stackp++ = file->tab_suffix[code]; code = file->tab_prefix[code]; } -- cgit v1.2.3