The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3938 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3938-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     October 29, 2024                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : exim4     Version        : 4.94.2-7+deb11u4     CVE ID         : CVE-2021-38371 CVE-2022-3559 CVE-2023-42117 CVE-2023-42119     Debian Bug     : 992172

    Multiple potential security vulnerabilities have been addressed in exim4, a     mail transport agent. These issues may allow remote attackers to disclose     sensitive information or execute arbitrary code but only if Exim4 is run behind     or with untrusted proxy servers or DNS resolvers. If your proxy-protocol proxy     or DNS resolver are trustworthy, you are not affected.

    For Debian 11 bullseye, these problems have been fixed in version     4.94.2-7+deb11u4.

    We recommend that you upgrade your exim4 packages.

    For the detailed security status of exim4 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/exim4

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-6881-1 advisory.

    It was discovered that Exim did not enforce STARTTLS sync point on client side. An attacker could possibly     use this issue to perform response injection during MTA SMTP sending.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of exim installed on the remote host is prior to 4.92-1.36. It is, therefore, affected by a vulnerability as referenced in the ALAS-2023-1722 advisory.

    The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.
    (CVE-2021-38371)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
209857	Debian dla-3938 : exim4 - security update	Nessus	Debian Local Security Checks	critical
201950	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : Exim vulnerability (USN-6881-1)	Nessus	Ubuntu Local Security Checks	high
173943	Amazon Linux AMI : exim (ALAS-2023-1722)	Nessus	Amazon Linux Local Security Checks	high

Detections

Analytics

CVE-2021-38371

high

Tenable Plugins

critical

high

high