Privilege escalation in System Security Services Daemon (SSSD)

1) Command Injection

EUVDB-ID: #VU56000

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 - Command injection

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:SSSD:sssd:2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:SSSD:sssd:2.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:SSSD:sssd:2.2.0:*:*:*:*:*:*:*

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.