PT-2021-3127 · Exim+3 · Exim+3

Published 2021-05-04 · Updated 2022-07-18 · CVE-2021-27216

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Exim versions prior to 4.94.2

Description The issue is related to errors in privilege management. It allows an attacker to delete arbitrary files in the system by leveraging a delete pid file race condition. This can be done using the -oP and -oPX options. A local user can exploit this to delete files as root.

Recommendations For Exim versions prior to 4.94.2, update to version 4.94.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the -oP and -oPX options to minimize the risk of exploitation.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

CWE-264

Related Identifiers

ALT-PU-2021-1764

ALT-PU-2022-2269

BDU:2021-02750

CVE-2021-27216

USN-4934-1

USN-4934-2

Affected Products

Alt Linux

Exim

Linuxmint

Ubuntu

References · 42

• 🔥 https://github.com/dorkerdevil/CVE-2020-28018 · Exploit
• 🔥❌ https://github.com/lmol/CVE-2020-28018 · Exploit, Deleted
• 🔥 https://exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28007-LFDIR.txt · Exploit
• https://ubuntu.com/security/notices/USN-4934-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28012 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28026 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28015 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27216 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-27216 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28016 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28020 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28024 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28019 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4934-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-28007 · Vendor Advisory