Vulnerability identifier: #VU34100
Vulnerability risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-367
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
FreeBSD
Operating systems & Components /
Operating system
Vendor: FreeBSD Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the sendmsg system call in the compat32 subsystem on 64-bit platforms has a time-of-check to time-of-use issue. A local user can tun a specially crafted program from userspace and modify control message headers after they are validation.
Successful exploitation of the vulnerability may allow an attacker to escalate privileges on the system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
FreeBSD: 11.0 - 12.1
External links
http://security.FreeBSD.org/advisories/FreeBSD-SA-20:23.sendmsg.asc
http://www.zerodayinitiative.com/advisories/ZDI-20-949/
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.