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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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Popularity:
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7,412 views
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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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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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