CVE-2018-7169

NameCVE-2018-7169
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs890557

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
shadow (PTS)jessie (security), jessie1:4.2-3+deb8u4vulnerable
stretch1:4.4-4.1vulnerable
buster, sid1:4.5-1.1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
shadowsource(unstable)(unfixed)medium890557

Notes

[stretch] - shadow <no-dsa> (Minor issue)
[jessie] - shadow <no-dsa> (Minor issue)
[wheezy] - shadow <no-dsa> (Minor issue)
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357
https://github.com/shadow-maint/shadow/pull/97

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