Improper Enforcement of Message Integrity During Transmission in a Communication Channel Affecting exim/exim package, versions [0,]


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.8% (82nd percentile)

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  • Snyk IDSNYK-UNMANAGED-EXIMEXIM-6139277
  • published25 Dec 2023
  • disclosed24 Dec 2023
  • creditSEC Consult

Introduced: 24 Dec 2023

CVE-2023-51766  (opens in a new tab)
CWE-924  (opens in a new tab)

How to fix?

A fix was pushed into the master branch but not yet published.

Overview

Affected versions of this package are vulnerable to Improper Enforcement of Message Integrity During Transmission in a Communication Channel due to improper handling of SMTP protocol sequences, which allows header smuggling. An attacker can inject e-mail messages that appear to originate from the server, thus bypassing SPF protection mechanisms by exploiting the support for <LF>.<CR><LF> sequences, which are not universally handled by other e-mail servers.

CVSS Scores

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