CVE Vulnerability

CVE-2018-7169

An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

5.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357 Exploit Issue Tracking
https://security.gentoo.org/glsa/201805-09 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:shadow_project:shadow:4.5:*:*:*:*:*:*:*
Information

Published : 2018-02-15 08:29

Updated : 2019-10-03 12:03

NVD link : CVE-2018-7169

Mitre link : CVE-2018-7169

Products Affected
No products.
CWE
CWE-732