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CVE-2014-2667

Status Candidate

Overview

Race condition in the _get_masked_mode function in Lib/os.py in Python 3.2 through 3.5, when exist_ok is set to true and multiple threads are used, might allow local users to bypass intended file permissions by leveraging a separate application vulnerability before the umask has been set to the expected value.

Related Files

Mandriva Linux Security Advisory 2015-076
Posted Mar 27, 2015
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2015-076 - Updated python3 packages fix security vulnerabilities. ZipExtFile.read goes into 100% CPU infinite loop on maliciously binary edited zips. A vulnerability was reported in Python's socket module, due to a boundary error within the sock_recvfrom_into() function, which could be exploited to cause a buffer overflow. This could be used to crash a Python application that uses the socket.recvfrom_info() function or, possibly, execute arbitrary code with the permissions of the user running vulnerable Python code. It was reported that a patch added to Python 3.2 caused a race condition where a file created could be created with world read/write permissions instead of the permissions dictated by the original umask of the process. This could allow a local attacker that could win the race to view and edit files created by a program using this call. Note that prior versions of Python, including 2.x, do not include the vulnerable _get_masked_mode() function that is used by os.makedirs() when exist_ok is set to True. Python are susceptible to arbitrary process memory reading by a user or adversary due to a bug in the _json module caused by insufficient bounds checking. The bug is caused by allowing the user to supply a negative value that is used an an array index, causing the scanstring function to access process memory outside of the string it is intended to access. The CGIHTTPServer Python module does not properly handle URL-encoded path separators in URLs. This may enable attackers to disclose a CGI script's source code or execute arbitrary scripts in the server's document root.

tags | advisory, overflow, arbitrary, local, cgi, root, vulnerability, python
systems | linux, mandriva
advisories | CVE-2013-7338, CVE-2014-1912, CVE-2014-2667, CVE-2014-4616, CVE-2014-4650
SHA-256 | ab76b20f26c250158d7fa23532b4b88bd262202a2dbe4ad2a031d1e8a96c39eb
Gentoo Linux Security Advisory 201503-10
Posted Mar 19, 2015
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201503-10 - Multiple vulnerabilities have been found in Python, the worst of which could lead to arbitrary code execution. Versions less than 3.3.5-r1 are affected.

tags | advisory, arbitrary, vulnerability, code execution, python
systems | linux, gentoo
advisories | CVE-2013-1752, CVE-2013-7338, CVE-2014-1912, CVE-2014-2667, CVE-2014-4616, CVE-2014-7185, CVE-2014-9365
SHA-256 | a9f61c24dc4fd90eec4a4d961874d8c10caaa2a0e38947b49c08bc7818eb3b95
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