PT-2020-6050 · Exim+5 · Exim+5

Published 2020-10-20 · Updated 2024-06-15 · CVE-2020-28025

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

Description The issue is related to an out-of-bounds read in the pdkim finish bodyhash function. This occurs because the function does not properly validate the relationship between sig->bodyhash.len and b->bh.len. As a result, a crafted DKIM-Signature header could potentially lead to a leak of sensitive information from process memory. The vulnerability may allow a remote attacker to access confidential information.

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 the use of the pdkim finish bodyhash function until a patch is available. Avoid using crafted DKIM-Signature headers in the affected Exim versions to minimize the risk of exploitation.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2021-1764

ALT-PU-2022-2269

BDU:2021-02769

CVE-2020-28025

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 · 107

• 🔥 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