Bug 224610 - CVE-2007-0455 gd buffer overrun
Summary: CVE-2007-0455 gd buffer overrun
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: gd
Version: 6
Hardware: All
OS: Linux
low
medium
Target Milestone: ---
Assignee: Ivana Varekova
QA Contact:
URL:
Whiteboard: impact=low,source=vendorsec,reported=...
Keywords: Security
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2007-01-26 17:53 UTC by Josh Bressers
Modified: 2007-11-30 22:11 UTC (History)
0 users

(edit)
Clone Of:
(edit)
Last Closed: 2007-01-29 09:25:02 UTC


Attachments (Terms of Use)

Description Josh Bressers 2007-01-26 17:53:19 UTC
+++ This bug was initially created as a clone of Bug #224607 +++

Kees Cook from Ubuntu reported a "off-the-end-of-string increment", which could
theoretically lead ot a buffer overflow.

This flaw would only be exploitable if a JIS-encoded font is used when
processing a special malicious string.

The issue here is that the NULL terminator is incremented, which could lead to
unknown results during the processing of the malicious string.

Index: gdft.c
===================================================================
RCS file: /repository/gd/libgd/gdft.c,v
retrieving revision 1.28
diff -u -p -r1.28 gdft.c
--- gdft.c      3 Jan 2007 21:21:21 -0000       1.28
+++ gdft.c      24 Jan 2007 23:00:55 -0000
@@ -1178,7 +1178,7 @@ fprintf(stderr,"dpi=%d,%d metric_res=%d 
                {
                  ch = c & 0xFF;        /* don't extend sign */
                }
-             next++;
+             if (*next) next++;
            }
            break;
          case gdFTEX_Big5:

This flaw also affects FC5

Comment 1 Ivana Varekova 2007-01-29 09:25:02 UTC
Fixed in gd-2.0.33-12.fc7 in devel branch (gd-2.0.33-10.fc6 - in fc6,
gd-2.0.33-7.fc5 in fc5)


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