CVE-2018-7169

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Summary

CVECVE-2018-7169
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2018-02-15 20:29:00 UTC
Updated2019-10-03 00:03:00 UTC
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.

Risk And Classification

Problem Types: CWE-732

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Shadow Project Shadow 4.5 All All All
Application Shadow Project Shadow 4.5 All All All

References

ReferenceSourceLinkTags
Shadow: security bypass (GLSA 201805-09) — Gentoo Security GENTOO security.gentoo.org Third Party Advisory
Bug #1729357 “unprivileged user can drop supplementary groups” : Bugs : shadow package : Ubuntu MISC bugs.launchpad.net Exploit, Issue Tracking, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 198646 Ubuntu Security Notification for shadow Vulnerabilities (USN-5254-1)
  • 710271 Gentoo Linux Shadow security bypass Vulnerability (GLSA 201805-09)
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