On Tue, Jun 01, 2004 at 02:53:28PM -0700, Matt Zimmerman wrote: > According to the information I have seen, this bug probably does not affect > woody, but I would appreciate confirmation, and to bring it to your > attention for unstable: > > http://bugs.xfree86.org/show_bug.cgi?id=1376 > http://www.openbsd.org/errata.html#xdm > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124900 > http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0419
Woody's XFree86 does not contain the offending missing code; its
CreateWellKnownSockets() function exits if request_port is zero:
[0] [EMAIL PROTECTED]:~/packages/xfree86/4.1.0/xfree86-4.1.0 % head -n 1
debian/changelog
xfree86 (4.1.0-16woody3) stable-security; urgency=high
[0] [EMAIL PROTECTED]:~/packages/xfree86/4.1.0/xfree86-4.1.0 % grep -5
request_port build-tree/xc/programs/xdm/socket.c
CreateWellKnownSockets (void)
{
struct sockaddr_in sock_addr;
char *name;
if (request_port == 0)
return;
Debug ("creating socket %d\n", request_port);
xdmcpFd = socket (AF_INET, SOCK_DGRAM, 0);
if (xdmcpFd == -1) {
LogError ("XDMCP socket creation failed, errno %d\n", errno);
return;
}
--
bzero ((char *) &sock_addr, sizeof (sock_addr));
#ifdef BSD44SOCKETS
sock_addr.sin_len = sizeof(sock_addr);
#endif
sock_addr.sin_family = AF_INET;
sock_addr.sin_port = htons ((short) request_port);
sock_addr.sin_addr.s_addr = htonl (INADDR_ANY);
if (bind (xdmcpFd, (struct sockaddr *)&sock_addr, sizeof (sock_addr)) ==
-1)
{
LogError ("error %d binding socket address %d\n", errno,
request_port);
close (xdmcpFd);
xdmcpFd = -1;
return;
}
WellKnownSocketsMax = xdmcpFd;
Some versions of XFree86 released to experimental, sid, and sarge were
vulnerable previously, but not at present:
xfree86 (4.3.0.dfsg.1-1) unstable; urgency=low
[...]
* Restore original xdm behavior of interpreting an XDMCP request port of
zero (the default) as an instruction not to open a port at all.
Equivalent code was apparently accidentally deleted in upstream CVS
(thanks, Jeff King). (Closes: #239341)
[...]
-- Fabio M. Di Nitto <[EMAIL PROTECTED]> Wed, 28 Apr 2004 18:55:17 +0200
Thanks for bringing this issue to my attention. I do not think
current Debian distribution, released or pending, is vulnerable to this
flaw.
Please let me know if there is anything more I can do.
--
G. Branden Robinson | The last Christian died on the
Debian GNU/Linux | cross.
[EMAIL PROTECTED] | -- Friedrich Nietzsche
http://people.debian.org/~branden/ |
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