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Insufficient Verification of Data Authenticity Affecting exim4 package, versions <4.92-8+deb10u9

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.28% (68th percentile)
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NVD
5.3 medium

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  • Snyk ID SNYK-DEBIAN10-EXIM4-6139201
  • published 24 Dec 2023
  • disclosed 24 Dec 2023
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Introduced: 24 Dec 2023

CVE-2023-51766 Open this link in a new tab
CWE-345 Open this link in a new tab

How to fix?

Upgrade Debian:10 exim4 to version 4.92-8+deb10u9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream exim4 package and not the exim4 package as distributed by Debian. See How to fix? for Debian:10 relevant fixed versions and status.

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.

References