Privilege Escalation in FreeBSD



Published: 2016-10-10 | Updated: 2016-10-11
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID N/A
CWE-ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
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FreeBSD
Operating systems & Components / Operating system

Vendor FreeBSD Foundation

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Privilege Escalation

EUVDB-ID: #VU822

Risk: High

CVSSv3.1:

CVE-ID: N/A

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to obtain elevated privileges on the target system.

The vulnerability exists due to improper processing of symbolic links (symlinks) or hard links. By
 overwriting files outside of the libarchive extraction directory or modifying the directory permissions a mailicious user can obtain root privileges on the system.

Successful exploitation of this vulnerability will allow the local attacker to obtain elevated privileges on vulnerable system.

Mitigation

Update patched versions:
- 10.1 (https://security.FreeBSD.org/patches/SA-16:31/libarchive-10.1.patch);
- 10.2 (https://security.FreeBSD.org/patches/SA-16:31/libarchive-10.2.patch);
- 10.3 (https://security.FreeBSD.org/patches/SA-16:31/libarchive-10.3.patch).

Vulnerable software versions

FreeBSD: 5.3 - 11.0


CPE2.3 External links

http://www.freebsd.org/security/advisories/FreeBSD-SA-16:31.libarchive.asc

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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