SecuritySpace - CVE-2018-7169

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CVE ID: CVE-2018-7169

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.

Test IDs: 1.3.6.1.4.1.25623.1.1.10.2018.0177 1.3.6.1.4.1.25623.1.1.4.2018.0662.1 1.3.6.1.4.1.25623.1.0.874657

Cross References: Common Vulnerability Exposure (CVE) ID: CVE-2018-7169
https://security.gentoo.org/glsa/201805-09
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357

CVE ID:	CVE-2018-7169
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.
Test IDs:	1.3.6.1.4.1.25623.1.1.10.2018.0177 1.3.6.1.4.1.25623.1.1.4.2018.0662.1 1.3.6.1.4.1.25623.1.0.874657
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2018-7169 https://security.gentoo.org/glsa/201805-09 https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357