PT-2020-6038 · Exim+5 · Exim+5

Published 2020-10-20 · Updated 2024-06-15 · CVE-2020-28013

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 caused by a heap-based buffer overflow due to the mishandling of negative sizes in strncpy, potentially allowing privilege escalation from any user to root. This occurs because of the interpretation of negative sizes. The parse fix phrase() function of the Exim message transfer agent is also affected by a buffer overflow in the heap, which may allow an attacker to elevate privileges in the system and execute arbitrary code.

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 Exim service to minimize the risk of exploitation.

Exploit

Fix

Heap Based Buffer Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-787

Related Identifiers

ALT-PU-2021-1764

ALT-PU-2022-2269

BDU:2021-02755

CVE-2020-28013

DLA-2650-1

DSA-4912-1

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

Astra Linux

Exim

Linuxmint

Suse

Ubuntu

References · 106

• 🔥 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/darsigovrustam/CVE-2019-10149 · Exploit
• 🔥 https://github.com/dorkerdevil/CVE-2020-28018 · Exploit
• 🔥 https://github.com/cloudflare/exim-cve-2019-10149-data · Exploit
• 🔥❌ https://github.com/lmol/CVE-2020-28018 · Exploit, Deleted
• https://osv.dev/vulnerability/openSUSE-SU-2021:0754-1 · Vendor Advisory