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vulnerability alert CVE-2013-2029

Nagios: file corruption via nagios.upgrade_to_v3.sh

Synthesis of the vulnerability

When the administrator runs the nagios.upgrade_to_v3.sh script, a local attacker can create a symbolic link, in order to corrupt a file with root privileges.
Impacted products: Fedora, Nagios Open Source, RHEL.
Severity: 2/4.
Creation date: 02/05/2013.
Identifiers: 958015, BID-59596, CVE-2013-2029, FEDORA-2013-10950, RHSA-2013:1526-01, VIGILANCE-VUL-12741.

Description of the vulnerability

The nagios.upgrade_to_v3.sh script is installed by some Linux distributions, in order to migrate Nagios to a recent version.

However, this script uses a predictable filename (/tmp/nagioscfg.$$.tmp) to store the configuration.

When the administrator runs the nagios.upgrade_to_v3.sh script, a local attacker can therefore create a symbolic link, in order to corrupt a file with root privileges.
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