Security Vulnerability in Solaris libpng(3) May Allow Denial of Service (DoS) or Privilege Escalation

1. Impact

Multiple security vulnerabilities in libpng(3), which is shipped with
Solaris, may allow a local or remote unprivileged user to cause a
denial of service (DoS) of applications linked to libpng(3), or
potentially to execute arbitrary code with the privileges of the user
running the application, when a user has loaded a specially crafted
Portable Network Graphics (PNG) format image file (.png) supplied by
an untrusted user.

These issues are also referenced in the following documents:

 CVE-2007-5267 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5267
 CVE-2008-3964 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3964
 CVE-2007-5266 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5266
 CVE-2007-5268 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5268
 CVE-2007-5269 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5269
 CVE-2008-1382 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1382
 CVE-2009-0040 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0040
 CERT VU#649212 http://www.kb.cert.org/vuls/id/649212

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• GNOME 2.0 (for Solaris 8)
• Solaris 9
• Solaris 10 without patch 137080-03
• OpenSolaris builds snv_01 through snv_112

x86 Platform

• GNOME 2.0 (for Solaris 8)
• Solaris 9
• Solaris 10 without patch 137081-03
• OpenSolaris builds snv_01 through snv_112

Note 1: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived.

The base build can be derived as follows:

         $ uname -v
          snv_101

Note 2: To determine if an application has a dynamic dependency on the
libpng(3) library, the ldd(1) utility can be used, for example:

    $ ldd /bin/evince | grep libpng
        libpng12.so.0 =>         /usr/lib/libpng12.so.0

However, some applications may use libpng(3) but not report libpng as
a dynamic dependency with ldd(1) if the library is loaded by
dlopen(3C). Therefore, to display all shared objects used by an
application, pldd(1) should be used against the running process:

    $ pldd <pid of application> | grep libpng
    /usr/lib/libpng12.so.0.18.0

3. Symptoms

If the described issues are exploited to cause a Denial of Service
(DoS), the application which links to the libpng(3) library will exit
and may generate an error message about a Segmentation Fault, possibly
writing a core(4) file.

There are no predictable symptoms which would indicate that these
issues have been exploited to execute arbitrary code.

4. Workaround

There is no workaround which would prevent these issues from being
exploited, therefore it is advisable not to load images from untrusted
sources with any affected applications until the Resolution for these
issues is in place.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 137080-03 or later
• OpenSolaris based upon builds snv_113 or later
  

x86 Platform

• Solaris 10 with patch 137081-03 or later
• OpenSolaris based upon builds snv_113 or later
  

Note that for Solaris 10 the issues referred to as CVE-2007-5267,
CVE-2008-3964, CVE-2007-5266, CVE-2007-5268, CVE-2007-5269, and
CVE-2008-1382 are resolved in patches 137080-02 and 137081-02 and
later revisions.

A final resolution is pending completion for Solaris 8 and 9.

For more information on Security Sun Alerts, see Technical Instruction ID 213557:
http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1

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