An issue was discovered in newgidmap, in shadow-utils, that allows an unprivileged user to be placed in a user namespace where setgroups is permitted. An attacker could use this flaw to remove himself 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.
Find out more about CVE-2018-7169 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of shadow-utils as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not provide newgidmap program.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 4.4 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | shadow-utils | Not affected |
| Red Hat Enterprise Linux 6 | shadow-utils | Not affected |
| Red Hat Enterprise Linux 5 | shadow-utils | Not affected |
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