Privilege escalation in Sudo



Published: 2017-05-31
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-1000367
CWE-ID CWE-77
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Sudo
Client/Desktop applications / Software for system administration

Vendor Sudo

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Command injection

EUVDB-ID: #VU6846

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2017-1000367

CWE-ID: CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')

Exploit availability: Yes

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to command validation flaw in the get_process_ttyname() function. A local attacker can issue a specially crafted sudo command, cause the system to recognize the user's tty as an arbitrary file and overwrite arbitrary files. Exploitation of the bug is possible in case a malicious user has sudo privileges, the system contains SELinux and sudo has been built on SELinux support.

Successful exploitation of the vulnerability results in root access to the system.

Mitigation

Update to version 1.8.20p1.

Vulnerable software versions

Sudo: 1.8.6p6 - 1.8.20


CPE2.3 External links

http://www.sudo.ws/alerts/linux_tty.html
http://www.openwall.com/lists/oss-security/2017/05/30/16

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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