CVE-2019-19882 — HIGH (7.8)

Vulnerability Description

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).

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Shadow Project	Shadow	4.8

Related Weaknesses (CWE)

CWE-732

References

https://bugs.archlinux.org/task/64836ExploitThird Party Advisory
https://bugs.gentoo.org/702252ExploitThird Party Advisory
https://github.com/shadow-maint/shadow/commit/edf7547ad5aa650be868cf2dac58944773PatchThird Party Advisory
https://github.com/shadow-maint/shadow/pull/199PatchThird Party Advisory
https://github.com/void-linux/void-packages/pull/17580PatchThird Party Advisory
https://security.gentoo.org/glsa/202008-09
https://bugs.archlinux.org/task/64836ExploitThird Party Advisory
https://bugs.gentoo.org/702252ExploitThird Party Advisory
https://github.com/shadow-maint/shadow/commit/edf7547ad5aa650be868cf2dac58944773PatchThird Party Advisory
https://github.com/shadow-maint/shadow/pull/199PatchThird Party Advisory
https://github.com/void-linux/void-packages/pull/17580PatchThird Party Advisory
https://security.gentoo.org/glsa/202008-09

FAQ

What is CVE-2019-19882?

CVE-2019-19882 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 affec...

How severe is CVE-2019-19882?

CVE-2019-19882 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2019-19882?

Check the references section above for vendor advisories and patch information. Affected products include: Shadow Project Shadow.