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libpng Unknown Chunk Processing Uninitialized Memory Access
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Secunia Advisory:
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SA29792
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Release Date:
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2008-04-14
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Last Update:
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2008-04-29
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Critical:
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Moderately critical
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Impact:
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Exposure of sensitive information
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: | libpng 1.x
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| | CVE reference: | CVE-2008-1382 (Secunia mirror)
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Description:
Tavis Ormandy has reported a vulnerability in libpng, which can be exploited by malicious people to cause a DoS (Denial of Service), disclose potentially sensitive information, or potentially compromise an application using the library.
The vulnerability is caused due to the improper handling of PNG chunks unknown to the library. This can be exploited to trigger the use of uninitialized memory in e.g. a "free()" call via unknown PNG chunks having a length of zero.
Successful exploitation may allow execution of arbitrary code, but requires that the application calls the "png_set_read_user_chunk_fn()" function or the "png_set_keep_unknown_chunks()" function under specific conditions.
The vulnerability is reported in versions 1.0.6 through 1.0.32 and 1.2.0 through 1.2.26.
Solution:
Update to version 1.0.33 or 1.2.27.
http://sourceforge.net/project/showfiles.php?group_id=5624
Provided and/or discovered by:
Tavis Ormandy, oCERT Team.
Changelog:
2008-04-29: Updated "Solution" section.
Original Advisory:
libpng:
http://libpng.sourceforge.net/Advisory-1.2.26.txt
oCERT:
http://www.ocert.org/advisories/ocert-2008-003.html
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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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8 Related Secunia Security Advisories
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1. libpng ICC Profile Chunk Denial of Service Vulnerability
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2. libpng Multiple Denial of Service Vulnerabilities
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3. libpng tRNS Chunk Denial of Service
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4. libpng sPLT Chunk Handling Denial of Service
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5. libpng "png_set_strip_alpha()" Buffer Overflow Vulnerability
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6. libpng Integer Overflow and Buffer Overflow Vulnerabilities
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7. libpng Multiple Vulnerabilities
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8. libpng Potential Denial of Service Vulnerability
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