Privilege escalation in FreeBSD 11.4



Published: 2020-07-09
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-7458
CWE-ID CWE-119
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 Bulletin

This security bulletin contains one low risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU29603

Risk: Low

CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-7458

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing long values passed via the user-controlled PATH environment variable in posix_spawnp(3). A local user can construct a specially crafted PATH environment variable and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.4


CPE2.3 External links

http://www.freebsd.org/security/advisories/FreeBSD-SA-20:18.posix_spawnp.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, proof of concept for this vulnerability is available.



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