Privilege escalation in FreeBSD



Published: 2020-07-09
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-7457
CWE ID CWE-416
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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FreeBSD
Operating systems & Components / Operating system

Vendor FreeBSD Foundation

Security Advisory

This security advisory describes one low risk vulnerability.

1) Use-after-free

Risk: Low

CVSSv3.1: 8.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-7457

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a race condition followed by a use-after-free error when processing IPv6 header options set by the IPV6_2292PKTOPTIONS socket option. A local user can set specially crafted IPv6 header options, trigger memory corruption and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0, 11.1, 11.2, 11.3, 11.4, 12.0, 12.1

CPE External links

https://www.freebsd.org/security/advisories/FreeBSD-SA-20:20.ipv6.asc

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. However, a fully functional exploit for this vulnerability is available.



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