Incorrect Permission Assignment for Critical Resource Affecting shadow package, versions <1:4.2-3.1ubuntu5.5+esm1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-SHADOW-306232
- published15 Feb 2018
- disclosed15 Feb 2018
Introduced: 15 Feb 2018
CVE-2018-7169 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 shadow to version 1:4.2-3.1ubuntu5.5+esm1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream shadow package and not the shadow package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
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.