Xdm May Open Random TCP Sockets
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SecurityTracker Alert ID: 1010306
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SecurityTracker URL: http://securitytracker.com/id?1010306
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CVE Reference: CAN-2004-0419
(Links to External Site)
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Updated: Jul 6 2004
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Original Entry Date: May 27 2004
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Impact: User access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Description: A vulnerability was reported in xdm. The software may open randmon TCP sockets.
Steve Rumble reported that xdm opens a chooserFd TCP socket even when DisplayManager.requestPort is set to 0.
The flaw resides in 'xc/programs/xdm/socket.c'.
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Impact: The software may open random TCP ports.
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Solution: The vendor has issued a patch (/cvs/xc/programs/xdm/socket.c), available via CVS.
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Vendor URL: bugs.xfree86.org/show_bug.cgi?id=1376 (Links to External Site)
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Cause: Access control error, State error
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Underlying OS: Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Wed, 26 May 2004 22:20:35 -0400
Subject: http://bugs.xfree86.org/show_bug.cgi?id=1376
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http://bugs.xfree86.org/show_bug.cgi?id=1376
Bugzilla Bug 1376
xdm opens random tcp sockets Last modified: 2004-05-19 22:25
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Description: Opened: 2004-05-19 21:44
Even when DisplayManager.requestPort is set to 0, xdm will open a chooserFd tcp
socket on all interfaces. This apparently cannot be disabled by configuration
and presents a possible security risk. Older versions of xdm/socket.c appear to
have checked and aborted if request_port == 0, but the current one does not.
Perhaps it was mistakenly forgotten while refactoring the code.
The following patch should resolve the issue:
Index: socket.c
===================================================================
RCS file: /cvs/xc/programs/xdm/socket.c,v
retrieving revision 3.16
diff -u -r3.16 socket.c
--- socket.c 30 Mar 2004 17:22:46 -0000 3.16
+++ socket.c 20 May 2004 01:33:02 -0000
@@ -66,6 +66,9 @@
char *name = localHostname ();
registerHostname (name, strlen (name));
+ if (request_port == 0)
+ return;
#if defined(IPv6) && defined(AF_INET6)
chooserFd = socket (AF_INET6, SOCK_STREAM, 0);
if (chooserFd < 0)
------- Additional Comment #1 From dawes@xfree86.org 2004-05-19 22:25 -------
committed -- thanks.
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