Denial of service in Exim



Published: 2022-11-24
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2022-3559
CWE-ID CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Exim
Server applications / Mail servers

Vendor Exim

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU69579

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2022-3559

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in the regex handler. A remote attacker can send specially crafted data to the mail server, trigger a use-after-free error and perform a denial of service (DoS) attack.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Exim: 4.87 - 4.96


CPE2.3 External links

http://git.exim.org/exim.git/commit/4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2
http://bugs.exim.org/show_bug.cgi?id=2915
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WFHLZVHNNO2GWYP5EA4TZQZ5O4GVPARR/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TMQ6OCKPNPBPSD37YR4FOWV2R54M2UEP/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EIH4W5R7SHTUEQFWWKB4TUO5YFZX64KV/

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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