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CVE-2018-7169

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5254-1
Posted Jan 28, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5254-1 - It was discovered that shadow incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash or expose sensitive information. This issue only affected Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. It was discovered that shadow incorrectly handled certain inputs. An attacker could possibly use this issue to expose sensitive information.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2017-12424, CVE-2018-7169
SHA-256 | 858b88ea3ec43f6082b7cd185a60cc2aa9521c63ecf08ddb13038428d330f54b
Download | Favorite | View
Gentoo Linux Security Advisory 201805-09
Posted May 23, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201805-9 - A vulnerability found in Shadow may allow local attackers to bypass security restrictions. Versions less than 4.6 are affected.

tags | advisory, local
systems | linux, gentoo
advisories | CVE-2018-7169
SHA-256 | e5db10936b8ea49eb1ee9d0e258728bf5131d1e687daa989b657ab9a509c7aeb
Download | Favorite | View
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