Privilege escalation in sudo



Published: 2019-10-15
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-14287
CWE-ID CWE-264
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) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU21782

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2019-14287

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

Exploit availability: Yes

Description

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

The vulnerability exists in the implementation of the "sudo" application when processing commands that are configured to run with ALL keyword. A local user with privileges to use sudo for specific applications on the system can escalate privileges and run the application as root (even if precisely restricted), if user id "-1" or "4294967295" is used.

Example:

The following entry instructs sudo to allow user bob to run "/usr/bin/id" command as any user on the system but root:

myhost bob = (ALL, !root) /usr/bin/id

The following command will allow bob execute the  "/usr/bin/id" command as root:

sudo -u#-1 id -u

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Sudo: 1.8.0 - 1.8.27


CPE2.3 External links

http://www.sudo.ws/alerts/minus_1_uid.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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