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Vulnerability of dracut: file corruption via Hardcoded Filenames

Synthesis of the vulnerability 

A local attacker can create a symbolic link, in order to alter the pointed file, with privileges of dracut.
Impacted software: openSUSE Leap.
Severity of this computer vulnerability: 1/4.
Creation date: 02/12/2015.
Références of this announce: openSUSE-SU-2015:2165-1, VIGILANCE-VUL-18412.

Description of the vulnerability 

The dracut product uses a constant temporary file name.

However, when the file is opened, the program does not check if it is an existing symbolic link. The file pointed by the link is thus opened with privileges of the program.

Moreover, the file name is predictable, and is located in a publicly writable directory, so the attacker can create the symbolic link before its usage.

A local attacker can therefore create a symbolic link, in order to alter the pointed file, with privileges of dracut.
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This cybersecurity vulnerability impacts software or systems such as openSUSE Leap.

Our Vigil@nce team determined that the severity of this vulnerability is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this weakness alert.

Solutions for this threat 

openSUSE: new dracut packages.
New packages are available:
  openSUSE Leap 42.1: dracut 037-68.1
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