Heap-based buffer overflow in Exim - CVE-2022-37452

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Main Vulnerability Database Vulnerabilities #VU66691

Heap-based buffer overflow in Exim - CVE-2022-37452

Published: August 22, 2022


Vulnerability identifier: #VU66691
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-37452
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error for the alias list within the host_name_lookup() function in host.c when the sender_host_name is set. A remote attacker can initiate a connection to the affected server, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

Exim
Ubuntu
exim4-base (Ubuntu package)
exim4-daemon-heavy (Ubuntu package)
exim4-daemon-light (Ubuntu package)
RecoverPoint for VMs

How to mitigate CVE-2022-37452

Install update from vendor's website.

Exim - update to 4.95
exim4-base (Ubuntu package) - addressed in versions 4.90.1-1ubuntu1.9, 4.93-13ubuntu1.6
exim4-daemon-heavy (Ubuntu package) - addressed in versions 4.90.1-1ubuntu1.9, 4.93-13ubuntu1.6
exim4-daemon-light (Ubuntu package) - addressed in versions 4.90.1-1ubuntu1.9, 4.93-13ubuntu1.6
RecoverPoint for VMs - update to 6.0.SP1.P1

External References

Related Security Bulletins