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Insecure Library Loading
Moderately critical

python-cjson Unicode Character Encoding Buffer Overflow Vulnerability

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Release Date:  2010-07-01    Views:  3,470

Secunia Advisory SA40335

Where:

From remote

Impact:

DoS, System access

Solution Status:

Unpatched

Software:

CVE Reference(s):

Description


A vulnerability has been reported in python-cjson, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise an application using the module.

The vulnerability is caused due to a boundary error when encoding certain wide unicode character sequences. This can be exploited to cause a buffer overflow by e.g. tricking an application into encoding specially crafted wide unicode strings.

The vulnerability is reported in version 1.0.5 on UCS4 builds. Other versions may also be affected.


Solution:
Use another module.

Provided and/or discovered by:
Matt Giuca

Original Advisory:
https://bugs.launchpad.net/ubuntu/+source/python-cjson/+bug/585274

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: python-cjson Unicode Character Encoding Buffer Overflow Vulnerability

User Message
mgiuca RE: python-cjson Unicode Character Encoding Buffer Overflow Vulnerability
Member 13th Aug, 2010 03:47
Score: 5
Posts: 1
User Since: 13th Aug 2010
System Score: N/A
Location: AU
Last edited on 13th Aug, 2010 03:47
I originally reported this bug (on Launchpad) and submitted a patch, which was accepted at least in Debian and Ubuntu awhile back. On those platforms, this module is patched automatically.

This advisory says "unpatched" with the solution being to "use another module". However, there is a patch available at:
http://launchpadlibrarian.net/49116913/encode-hard...
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