Bug 224610 - CVE-2007-0455 gd buffer overrun
CVE-2007-0455 gd buffer overrun
Status: CLOSED ERRATA
Product: Fedora
Classification: Fedora
Component: gd (Show other bugs)
6
All Linux
low Severity medium
: ---
: ---
Assigned To: Ivana Varekova
impact=low,source=vendorsec,reported=...
: Security
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2007-01-26 12:53 EST by Josh Bressers
Modified: 2007-11-30 17:11 EST (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2007-01-29 04:25:02 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)

  None (edit)
Description Josh Bressers 2007-01-26 12:53:19 EST
+++ 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 04:25:02 EST
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)

Note You need to log in before you can comment on or make changes to this bug.