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libpng invalid sCAL chunk processing vulnerability

Vulnerability Note VU#819894

Original Release Date: 2011-07-07 | Last Revised: 2011-07-07

Overview

libpng reads uninitialized memory when processing invalid sCAL chunks.

Description

When libpng encounters a sCAL chunk that is empty it will read uninitialized memory. libpng also does not properly handle a sCAL chunk that lacks the terminating zero between the two strings conveyed.

Additional details can be found on the png-mng-implement mailing list archives.

Impact

By tricking a user into opening a specifically crafted PNG file within an application that uses libpng, an attacker may be able to cause a denial of service crash.

Solution

Apply an Update
This vulnerability is addressed in the following libpng versions: libpng-1.5.4, libpng-1.4.8, libpng-1.2.45, and libpng-1.0.55

Vendor Information

819894
Expand all

libpng

Notified:  July 07, 2011 Updated:  July 07, 2011

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Credit

Thanks to Glenn Randers-Pehrson for reporting this vulnerability.

This document was written by Jared Allar.

Other Information

CVE IDs: None
Severity Metric: 0.65
Date Public: 2011-07-07
Date First Published: 2011-07-07
Date Last Updated: 2011-07-07 18:39 UTC
Document Revision: 10

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