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GHSA-8w6w-23mq-h8rg
No affected components available
Summary
In the Debian.sudoers file, apt-get is allowed for the nagios user. The full command including the arguments are not enforced and can therefore be choosen arbitrarily. This allows to easily get a root shell as the nagios user:
PoC
By choosing a particular argument, you can get (as a nagios user) a root shell:
sudo apt-get update -o APT::Update::Pre-Invoke::="/bin/sh"
Since the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root.
Impact
The vulnerability is a local privilege escalation, impacting users who use the provided sudoers file. It requires that an attacker already compromised the nagios account (which is quite a high barrier to be honest).
Fix
Since only one place where apt-get is currently used (in deb-updates) was found, it should be enough to allow only the specific arguments used there.
Here an example how the line in the sudoers file could look like:
/usr/lib64/nagios/plugins/strongswan-connections,\
/usr/lib64/nagios/plugins/systemd-unit,\
/usr/bin/apt-get update --quiet 2
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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