FreeBSD : ruby -- Unintentional file creation caused by inserting an illegal NUL character (3decc87d-2498-11e2-b0c7-000d601460a4)

This script is Copyright (C) 2012-2013 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The official ruby site reports :

A vulnerability was found that file creation routines can create
unintended files by strategically inserting NUL(s) in file paths. This
vulnerability has been reported as CVE-2012-4522.

Ruby can handle arbitrary binary patterns as Strings, including NUL
chars. On the other hand OSes and other libraries tend not. They
usually treat a NUL as an End of String mark. So to interface them
with Ruby, NUL chars should properly be avoided.

However methods like IO#open did not check the filename passed to
them, and just passed those strings to lower layer routines. This led
to create unintentional files.

See also :

http://www.nessus.org/u?d494f86f
https://access.redhat.com/security/cve/CVE-2012-4522/
http://www.nessus.org/u?8da57fe2

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 62792 ()

Bugtraq ID:

CVE ID: CVE-2012-4522

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