python-jinja2 arbitrary code execution vulnerability

2014.01.10
Credit: Ratul Gupta
Risk: High
Local: No
Remote: Yes
CVE: CVE-2014-1402
CWE: CWE-264


CVSS Base Score: 4.4/10
Impact Subscore: 6.4/10
Exploitability Subscore: 3.4/10
Exploit range: Local
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

Hello, Jinja2, a template engine written in pure python, was found to use /tmp as a default directory for jinja2.bccache.FileSystemBytecodeCache, which is insecure because the /tmp directory is world-writable and the filenames used like 'FileSystemBytecodeCache' are often predictable. A malicious user could exploit this bug to execute arbitrary code as another user. PoC is given on the debian page: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734747 References: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734747 https://bugzilla.redhat.com/show_bug.cgi?id=1051421

References:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734747
https://bugzilla.redhat.com/show_bug.cgi?id=1051421


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