FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

ruby -- Unintentional file creation caused by inserting an illegal NUL character

Affected packages
1.9.3,1 < ruby <,1


VuXML ID 3decc87d-2498-11e2-b0c7-000d601460a4
Discovery 2012-10-12
Entry 2012-11-01

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.


CVE Name CVE-2012-4522