PT-2020-14763 · Canonical+2 · Accountsservice+3

Kevin Backhouse + 1 · Published 2019-07-30 · Updated 2020-11-24 · CVE-2020-16127

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions AccountsService versions prior to 0.6.55-0ubuntu13.2

Description The issue arises from an Ubuntu-specific modification to AccountsService, which performs unbounded read operations on user-controlled ~/.pam environment files. This can lead to an infinite loop if /dev/zero is symlinked to this location.

Recommendations For versions prior to 0.6.55-0ubuntu13.2, update to version 0.6.55-0ubuntu13.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the ~/.pam environment files to prevent exploitation.

Exploit

Fix

Infinite Loop

RCE

Weakness Enumeration

CWE-835

CWE-20

Related Identifiers

ALT-PU-2019-2323

ALT-PU-2019-2368

CVE-2020-16127

USN-4616-1

Affected Products

Alt Linux

Accountsservice

Linuxmint

Ubuntu

References · 12

• 🔥 https://securitylab.github.com/advisories/GHSL-2020-187-accountsservice-drop-privs-DOS · Exploit
• https://ubuntu.com/security/CVE-2018-14036 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-16127 · Security Note
• https://osv.dev/vulnerability/CVE-2020-16127 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-16127 · Security Note
• https://ubuntu.com/security/notices/USN-4616-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-16126 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-16127 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-16127 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4616-1 · Vendor Advisory
• https://t.me/cibsecurity/16141 · Telegram Post
• https://t.me/cvenotify/6150 · Telegram Post