Privilege escalation in Traffix SDC kernel component

1) Use-after-free

EUVDB-ID: #VU56393

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3715

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem (route4_change() function in net/sched/cls_route.c) in the way it handled changing of classification filters. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Traffix SDC: 5.1.0 CF 19 - 5.1.0

CPE2.3

• cpe:2.3:a:f5_networks:traffix_sdc:5.1.0:CF 19:*:*:*:*:*:*
• cpe:2.3:a:f5_networks:traffix_sdc:5.1.0:CF 22:*:*:*:*:*:*
• cpe:2.3:a:f5_networks:traffix_sdc:5.1.0:*:*:*:*:*:*:*

External links

https://support.f5.com/csp/article/K03674368

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.