Red Hat Bugzilla – Bug 204052
vncserver PCF handling Integer overflow
Last modified: 2013-04-30 19:34:01 EDT
For FC6 test 2 +++ This bug was initially created as a clone of Bug #202469 +++ An integer overflow was discovered in the way freetype processes malformed PCF files. It seems that Xorg also contains the same PCF processing code as freetype, there it too is vulnerable this issue. We initally described this issue for freetype in bug 190593. The upstream bug is here: https://bugs.freedesktop.org/show_bug.cgi?id=7535 -- Additional comment from bressers@redhat.com on 2006-08-14 14:09 EST -- The upstream patch is attachment 134155 [details] -- Additional comment from bressers@redhat.com on 2006-08-15 20:42 EST -- Created an attachment (id=134276) Demo font file This issue also affects the vncserver shipped with RHEL2.1 and RHEL3 -- Additional comment from mgrac@redhat.com on 2006-08-23 08:13 EST -- Affected code is not in the VNC package -- Additional comment from bressers@redhat.com on 2006-08-23 08:35 EST -- I can make the vnc server crash by using the demo font file. Differnt issue perhaps? -- Additional comment from mgrac@redhat.com on 2006-08-24 10:06 EST -- My fault, there were two files with same name and I have checked just one of them. After applying proposed patch the vncserver works correctly (xfontsel crashes).
I've done some thinking about this and I'm removing the Security keyword. There is no way this can be considered a security issue, it's simply a bug. The only way this is exploitable is if a bad font can be included in the vncserver font path. That means that an attacker already has access to the account in question.
vncserver up to FC-5 uses different xorg-server which isn't affected by this bug