CVE-2018-7169 — MEDIUM (5.3)

Vulnerability Description

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.

CVSS Score

5.3

MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Shadow Project	Shadow	4.5

Related Weaknesses (CWE)

CWE-732

References

https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357ExploitIssue TrackingThird Party Advisory
https://security.gentoo.org/glsa/201805-09Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357ExploitIssue TrackingThird Party Advisory
https://security.gentoo.org/glsa/201805-09Third Party Advisory

FAQ

What is CVE-2018-7169?

CVE-2018-7169 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 t...

How severe is CVE-2018-7169?

CVE-2018-7169 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-7169?

Check the references section above for vendor advisories and patch information. Affected products include: Shadow Project Shadow.