PublicDate: 2007-10-08 21:17:00 UTC
PublicDateAtUSN: 2007-10-08
Candidate: CVE-2007-5269
References:
 https://ubuntu.com/security/notices/USN-538-1
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5269
Description:
 Certain chunk handlers in libpng before 1.0.29 and 1.2.x before 1.2.21
 allow remote attackers to cause a denial of service (crash) via crafted (1)
 pCAL (png_handle_pCAL), (2) sCAL (png_handle_sCAL), (3) tEXt
 (png_push_read_tEXt), (4) iTXt (png_handle_iTXt), and (5) ztXT
 (png_handle_ztXt) chunking in PNG images, which trigger out-of-bounds read
 operations.
Ubuntu-Description:
Notes:
 jdstrand> assigned medium because of wide install base
 jdstrand> looking at diff between 1.2.20 and 1.2.21, it appears that Ubuntu
   is affected, though Debian thinks not.  After weeding out the changes,
   there are 9 chunks over pngpread.c and pngrutil.c that appear to be for
   this CVE (the original patch improperly used png_strncpy, where our versions
   have png_strcpy).  TODO: get a reproducer and/or verify png_strcpy is really
   not vulnerable.
 jdstrand> after talking on IRC, Debian agreed they are in fact affected
 jdstrand> 2007/10/24 RH update:
   https://rhn.redhat.com/errata/RHSA-2007-0992.html
 jdstrand> RH has added code to pngrtran.c that was not included upstream.
   Sticking with changes to pngpread.c and pngrutil.c until upstream can
   provide a reproducer.
Bugs:
Priority: medium
Discovered-by:
Assigned-to: jdstrand
CVSS: 
upstream_libpng: released (1.0.29 and 1.2.21)
dapper_libpng: released (1.2.8rel-5ubuntu0.3)
edgy_libpng: released (1.2.8rel-5.1ubuntu0.3)
feisty_libpng: released (1.2.15~beta5-1ubuntu1.1)
gutsy_libpng: released (1.2.15~beta5-2ubuntu0.1)
devel_libpng: not-affected (1.2.15~beta5-3)