full-disclosure - Linux Kernel CIFS Vulnerability

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Date: Thu, 09 Apr 2009 15:07:40 +0200
From: Andreas Bogk <andreas@...reas.org>
To: full-disclosure@...ts.grok.org.uk
Subject: Linux Kernel CIFS Vulnerability

Dear list,

as discovered by Felix von Leitner (http://blog.fefe.de/?ts=b72905a8), 
Linux kernel patch 2.6.29.1 contains:

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3667,7 +3667,7 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
                            BCC(smb_buffer_response)) {
                                kfree(tcon->nativeFileSystem);
                                tcon->nativeFileSystem =
-                                   kzalloc(length + 2, GFP_KERNEL);
+                                   kzalloc(2*(length + 1), GFP_KERNEL);
                                if (tcon->nativeFileSystem)
                                        cifs_strfromUCS_le(
                                                tcon->nativeFileSystem,

fixing a remotely exploitable buffer overflow vulnerability in the CIFS protocol.

Neither the Linux kernel team, the CIFS maintainers nor any of the commercial Linux distributors bothered to send out an advisory.
I'm at loss for words other than "irresponsible, arrogant assholes".  Linux 2009 == Microsoft 2002.

Andreas

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