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Exim: Insufficient Verification of Data Authenticity (CVE-2023-51766)

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Exim: Insufficient Verification of Data Authenticity (CVE-2023-51766)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
12/24/2023
Created
01/09/2024
Added
01/08/2024
Modified
02/05/2024

Description

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

Solution(s)

  • exim-upgrade-4_97_1

References

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