#VU56000 Command Injection in SSSD - CVE-2021-3621

Vulnerability identifier: #VU56000

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3621

CWE-ID: CWE-77

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SSSD
Web applications / Remote management & hosting panels

Vendor: SSSD

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper input validation in the sssctl command within the logs-fetch and cache-expire subcommands. An attacker can trick the root user into running a specially crafted sssctl command, such as via sudo, and execute arbitrary code with root privileges.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SSSD: 2.0.0 - 2.5.2

---

External links
https://bugzilla.redhat.com/show_bug.cgi?id=1975142
https://github.com/SSSD/sssd/releases/tag/2.6.0

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.