ArchLinux: 201409-3: python2: Information leakage through integer overflow

    Date26 Sep 2014
    CategoryArchLinux
    140
    Posted ByLinuxSecurity Advisories
    The package python2 before version 2.7.8-1 is vulnerable to an integer overflow vulnerability.
    Arch Linux Security Advisory ASA-201409-3
    =========================================
    
    Severity: Low
    Date    : 2014-09-26
    CVE-ID  : CVE-2014-7185
    Package : python2
    Type    : Integer overflow
    Remote  : No
    Link    : https://wiki.archlinux.org/index.php/CVE-2014
    
    Summary
    =======
    
    The package python2 before version 2.7.8-1 is vulnerable to an integer
    overflow vulnerability.
    
    Resolution
    ==========
    
    Upgrade to 2.7.8-1.
    
    $ pacman -Syu "python2>=2.7.8-1"
    
    The problem has been fixed upstream in version 2.7.8 [1].
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    It was reported that Python 2.7.8 fixes a potential wraparound in
    buffer() with possible CWE-200 implications. This could allow an
    attacker to access private information through information leakage.
    
    PoC:
    
    --- overflow.py ---
    import sys
    a = bytearray('here be dragons')
    b = buffer(a, sys.maxsize, sys.maxsize)
    print b[:8192]
    -------------------
    
    References
    ==========
    
    [1] https://www.python.org/downloads/release/python-278/
    http://bugs.python.org/issue21831
    https://bugzilla.redhat.com/show_bug.cgi?id=1146026
    
    
    
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