CVE-2023-48643 Command injection in n/a
Unauthenticated remote attackers can execute arbitrary commands on Shrubbery tac_plus servers if pre-authorization directives are configured without a pre-shared secret.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-48643?
CVE-2023-48643 is a critical command injection vulnerability in n/a, published on 16 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Shrubbery tac_plus 2.x, 3.x. and 4.x through F4.0.4.28 allows unauthenticated Remote Command Execution. The product allows users to configure authorization checks as shell commands through the tac_plus.cfg configuration file. These are executed when a client sends an authorization request with a username that has pre-authorization directives configured. However, it is possible to inject additional commands into these checks because strings from TACACS+ packets are used as command-line arguments. If the installation lacks a a pre-shared secret (there is no pre-shared secret by default), then the injection can be triggered without authentication. (The attacker needs to know a username configured to use a pre-authorization command.) NOTE: this is related to CVE-2023-45239 but the issue is in the original Shrubbery product, not Meta's fork.
Weakness: CWE-94
Which versions are affected by CVE-2023-48643?
How do I fix CVE-2023-48643?
No fix has been published for CVE-2023-48643 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2023-48643 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-48643 exists.
Sources
Also known as GHSA-hp95-552p-6qxj.