CVE-2022-0563

2022-02-2100:00:00

ubuntu.com

136

util-linux

chfn

chsh

readline support

privilege escalation

root-owned files

CVSS2

1.9

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:M/Au:N/C:P/I:N/A:N

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.001

Percentile

17.2%

JSON

A flaw was found in the util-linux chfn and chsh utilities when compiled
with Readline support. The Readline library uses an “INPUTRC” environment
variable to get a path to the library config file. When the library cannot
parse the specified file, it prints an error message containing data from
the file. This flaw allows an unprivileged user to read root-owned files,
potentially leading to privilege escalation. This flaw affects util-linux
versions prior to 2.37.4.

Notes

Author	Note
alexmurray	In Ubuntu chfn and chsh are not built from the util-linux source package but instead from the passwd package so are not affected by this vulnerability.