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CVE-2019-19882

Status Candidate

Overview

shadow 4.8, in certain circumstances affecting at least Gentoo, Arch Linux, and Void Linux, allows local users to obtain root access because setuid programs are misconfigured. Specifically, this affects shadow 4.8 when compiled using --with-libpam but without explicitly passing --disable-account-tools-setuid, and without a PAM configuration suitable for use with setuid account management tools. This combination leads to account management tools (groupadd, groupdel, groupmod, useradd, userdel, usermod) that can easily be used by unprivileged local users to escalate privileges to root in multiple ways. This issue became much more relevant in approximately December 2019 when an unrelated bug was fixed (i.e., the chmod calls to suidusbins were fixed in the upstream Makefile which is now included in the release version 4.8).

Related Files

Gentoo Linux Security Advisory 202008-09
Posted Aug 25, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202008-9 - Multiple Shadow utilities were installed with setuid permissions, allowing possible root privilege escalation. Versions less than 4.8-r3 are affected.

tags | advisory, root
systems | linux, gentoo
advisories | CVE-2019-19882
SHA-256 | ace77c56cf5264ea4aac3e1e28a6d67f03b4f02c79b486990f85dc68b0ed6863
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