PT-2021-3129 · Exim+4 · Exim+4

Published 2021-05-04 · Updated 2024-06-15 · CVE-2020-28016

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 a buffer overflow in the parse fix phrase() function of the Exim message transfer agent, which can be exploited to gain privileges in the system and execute arbitrary code. The problem arises from the mishandling of the input "-F ' '" by the parse fix phrase() function, leading to an off-by-two out-of-bounds write.

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 parse fix phrase() function until a patch is applied.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2021-1764

ALT-PU-2022-2269

BDU:2021-02756

CVE-2020-28016

OPENSUSE-SU-2021:0677-1

OPENSUSE-SU-2021:0753-1

OPENSUSE-SU-2021:0754-1

OPENSUSE-SU-2021_0677-1

OPENSUSE-SU-2024:10746-1

USN-4934-1

USN-4934-2

Affected Products

Alt Linux

Exim

Linuxmint

Suse

Ubuntu

References · 96

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/exim4_deliver_message_priv_esc.rb · Exploit
• 🔥 https://github.com/qazbnm456/awesome-cve-poc/blob/master/Stack-Clash.md · Exploit
• 🔥 https://github.com/synacktiv/Exim-CVE-2019-15846 · Exploit
• 🔥 https://github.com/LetUsFsck/PoC-Exploit-Mirror/tree/master/CVE-2017-16944 · Exploit
• 🔥 https://github.com/Diefunction/CVE-2019-10149 · Exploit
• 🔥 https://github.com/cowbe0x004/eximrce-CVE-2019-10149 · Exploit
• 🔥 https://github.com/MNEMO-CERT/PoC--CVE-2019-10149_Exim · Exploit
• 🔥 https://github.com/martinclauss/exim-rce-cve-2018-6789 · Exploit
• 🔥 https://github.com/synacktiv/Exim-CVE-2018-6789 · Exploit
• 🔥 https://github.com/AzizMea/CVE-2019-10149-privilege-escalation · Exploit
• 🔥 https://github.com/dorkerdevil/CVE-2020-28018 · Exploit
• 🔥 https://github.com/darsigovrustam/CVE-2019-10149 · Exploit
• 🔥 https://github.com/cloudflare/exim-cve-2019-10149-data · Exploit
• 🔥❌ https://github.com/lmol/CVE-2020-28018 · Exploit, Deleted
• https://exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28016-PFPZA.txt · Vendor Advisory