This module exploits CVE-2014-9390, which affects Git (versions less
than 126.96.36.199, 1.9.5, 2.0.5, 2.1.4 and 2.2.1) and Mercurial (versions
less than 3.2.3) and describes three vulnerabilities.
On operating systems which have case-insensitive file systems, like
Windows and OS X, Git clients can be convinced to retrieve and
overwrite sensitive configuration files in the .git
directory which can allow arbitrary code execution if a vulnerable
client can be convinced to perform certain actions (for example,
a checkout) against a malicious Git repository.
A second vulnerability with similar characteristics also exists in both
Git and Mercurial clients, on HFS+ file systems (Mac OS X) only, where
certain Unicode codepoints are ignorable.
The third vulnerability with similar characteristics only affects
Mercurial clients on Windows, where Windows "short names"
(MS-DOS-compatible 8.3 format) are supported.
Today this module only truly supports the first vulnerability (Git
clients on case-insensitive file systems) but has the functionality to
support the remaining two with a little work.
- Jon Hart <firstname.lastname@example.org>