sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

Note that Nessus relies on the presence of the package as reported by the vendor.

An update of the sendmail package has been released.

The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dla-3829 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3829-2                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     June 20, 2024                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : sendmail     Version        : 8.15.2-14~deb10u3

    Fixing CVE-2023-51765 (smtp smuggling) requires to reject     email that include NUL bytes, in some configuration.

    Previous security version of sendmail, by default, does not     reject email that include NUL bytes.

    For Debian 10 buster, this problem has been fixed in version     8.15.2-14~deb10u3.

    We recommend that you upgrade your sendmail packages.

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

    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

Tenable has extracted the preceding description block directly from the Debian 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 AIX installed on the remote host is prior to APAR IJ50428. It is, therefore, affected by a vulnerability as referenced in the IJ50428 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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 AIX installed on the remote host is prior to APAR IJ50424. It is, therefore, affected by a vulnerability as referenced in the IJ50424 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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 AIX installed on the remote host is prior to APAR IJ50433. It is, therefore, affected by a vulnerability as referenced in the IJ50433 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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 AIX installed on the remote host is prior to APAR IJ50432. It is, therefore, affected by a vulnerability as referenced in the IJ50432 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2024:0742-1 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2024:0743-1 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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 sendmail installed on the remote host is prior to 8.18.1. It is, therefore, affected by a vulnerability as referenced in the SSA:2024-031-01 advisory.

  - sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other     popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
    (CVE-2023-51765)

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
225914	Linux Distros Unpatched Vulnerability : CVE-2023-51765	Nessus	Misc.	medium
204225	Photon OS 5.0: Sendmail PHSA-2024-5.0-0192	Nessus	PhotonOS Local Security Checks	medium
203554	Photon OS 4.0: Sendmail PHSA-2024-4.0-0560	Nessus	PhotonOS Local Security Checks	medium
200639	Debian dla-3829 : libmilter-dev - security update	Nessus	Debian Local Security Checks	medium
195317	AIX (IJ50428)	Nessus	AIX Local Security Checks	medium
195316	AIX (IJ50424)	Nessus	AIX Local Security Checks	medium
195314	AIX (IJ50433)	Nessus	AIX Local Security Checks	medium
195310	AIX (IJ50432)	Nessus	AIX Local Security Checks	medium
191703	SUSE SLES12 Security Update : sendmail (SUSE-SU-2024:0742-1)	Nessus	SuSE Local Security Checks	medium
191532	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : sendmail (SUSE-SU-2024:0743-1)	Nessus	SuSE Local Security Checks	medium
189867	Slackware Linux 15.0 / current sendmail Vulnerability (SSA:2024-031-01)	Nessus	Slackware Local Security Checks	medium

Detections

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CVE-2023-51765

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