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Pnmtopng "alphas_of_color" and "read_text" Buffer Overflow Vulnerabilities
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Secunia Advisory:
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SA17544
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Release Date:
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2005-11-15
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Last Update:
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2005-11-22
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Pnmtopng 2.x
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| | CVE reference: | CVE-2005-3632 (Secunia mirror)
CVE-2005-3662 (Secunia mirror)
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Description:
Two vulnerabilities have been reported in pnmtopng, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise a vulnerable system.
1) A boundary error exists when writing RGBA-palette PNG files. This can be exploited to crash pnmtopng and may allow arbitrary code execution via a specially crafted input file with exactly 256 colours.
2) A boundary error exists in "read_text()" when reading the text chunk of an input file. This can be exploited to cause a stack-based buffer overflow when the text chunk exceeds 256 bytes.
Successful exploitation requires that pnmtopng is used with the "-alpha" or the "-text" command line, and e.g. pnmtopng is used in a CGI application that allows remote users to submit image files for processing, or by tricking a user to use pnmtopng with a malicious ".pnm" file.
The vulnerabilities have been reported in versions prior to 2.39.
Note: Several potential malloc allocation overflow bugs have also been fixed.
Solution:
Update to version 2.39.
http://sourceforge.net/project/showfi...ackage_id=88579&release_id=370545
Provided and/or discovered by:
Reported by vendor.
Changelog:
2005-11-22: Added CVE reference. Added information about additional vulnerability. Updated "Name" and "Description" sections.
Original Advisory:
http://sourceforge.net/project/shownotes.php?release_id=370545
Other References:
SA17221:
http://secunia.com/advisories/17221/
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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