Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554.

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 Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-0abcfebecd advisory.

    Automatic update for exim-4.96.1-1.fc40.

    ##### **Changelog**

    ```
    * Mon Oct  2 2023 Jaroslav karvada <jskarvad@redhat.com> - 4.96.1-1
    - New version       Resolves: rhbz#2241735       Resolves: rhbz#2241538       Resolves: rhbz#2241539       Resolves: rhbz#2241525       Resolves: rhbz#2241527       Resolves: rhbz#2241528       Resolves: rhbz#2241529       Resolves: rhbz#2241531       Resolves: rhbz#2241532       Resolves: rhbz#2241542       Resolves: rhbz#2241544

    ```

Tenable has extracted the preceding description block directly from the Fedora 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 host is affected by the vulnerability described in GLSA-202402-18 (Exim: Multiple Vulnerabilities)

  - 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. (CVE-2023-51766)

  - NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability [epel-all] (CVE-2023-42114)

  - AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability [epel-all] (CVE-2023-42115)

  - Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability (CVE-2023-42116,     CVE-2023-42117)

  - dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability [epel-all] (CVE-2023-42119)

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

The remote openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2024:0007-1 advisory.

  - A vulnerability was found in Exim and classified as problematic. This issue affects some unknown     processing of the component Regex Handler. The manipulation leads to use after free. The name of the patch     is 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2. It is recommended to apply a patch to fix this issue. The     identifier VDB-211073 was assigned to this vulnerability. (CVE-2022-3559)

  - NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability [epel-all] (CVE-2023-42114)

  - AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability [epel-all] (CVE-2023-42115)

  - Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability (CVE-2023-42116,     CVE-2023-42117)

  - dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability [epel-all] (CVE-2023-42119)

  - 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. (CVE-2023-51766)

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

The remote Fedora 39 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-f1c8e4c1cc advisory.

    This is new version of exim.

    ----

    This is an exim update fixing several security problems.

Tenable has extracted the preceding description block directly from the Fedora 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 16.04 ESM / 18.04 ESM / 20.04 LTS / 22.04 LTS / 23.04 / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6455-1 advisory.

    It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to     memory corruption. A remote attacker could possibly use this issue to execute arbitrary code.
    (CVE-2023-42117)

    It was discovered that Exim incorrectly handled validation of user-supplied data, which could lead to an     out-of-bounds read. An attacker could possibly use this issue to expose sensitive information.
    (CVE-2023-42119)

Tenable has extracted the preceding description block directly from the Ubuntu 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 version of exim installed on the remote host is prior to 4.92-1.39. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1860 advisory.

    Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability

    NOTE: https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ (CVE-2023-42116)

    Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability

    NOTE: https://www.zerodayinitiative.com/advisories/ZDI-23-1471/ (CVE-2023-42117)

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

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

According to its banner, the version of Exim running on the remote host is prior to 4.96.2. It is, therefore, potentially affected by multiple vulnerabilities:

  - Improper Neutralization of Special Elements (CVE-2023-42117)

  - dnsdb Out-Of-Bounds Read (CVE-2023-42119)

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

The remote openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2023:0303-1 advisory.

  - Improper Neutralization of Special Elements Remote Code Execution Vulnerability [fedora-all]     (CVE-2023-42117)

  - dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability [fedora-all] (CVE-2023-42119)

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

The remote openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2023:0304-1 advisory.

  - Improper Neutralization of Special Elements Remote Code Execution Vulnerability [fedora-all]     (CVE-2023-42117)

  - dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability [fedora-all] (CVE-2023-42119)

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

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-0a7690525f advisory.

    This is an exim update fixing several security problems.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-42313af0de advisory.

    This is exim update fixing several security problems.

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

Note that Nessus has not tested for these issues 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	high
194566	Fedora 40 : exim (2023-0abcfebecd)	Nessus	Fedora Local Security Checks	critical
190665	GLSA-202402-18 : Exim: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	medium
187650	openSUSE 15 Security Update : exim (openSUSE-SU-2024:0007-1)	Nessus	SuSE Local Security Checks	medium
185341	Fedora 39 : exim (2023-f1c8e4c1cc)	Nessus	Fedora Local Security Checks	critical
183929	Ubuntu 16.04 ESM / 18.04 ESM / 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : Exim vulnerabilities (USN-6455-1)	Nessus	Ubuntu Local Security Checks	high
183852	Amazon Linux AMI : exim (ALAS-2023-1860)	Nessus	Amazon Linux Local Security Checks	high
183510	Exim < 4.96.2 Multiple Vulnerabilities	Nessus	SMTP problems	high
183383	openSUSE 15 Security Update : exim (openSUSE-SU-2023:0303-1)	Nessus	SuSE Local Security Checks	high
183362	openSUSE 15 Security Update : exim (openSUSE-SU-2023:0304-1)	Nessus	SuSE Local Security Checks	high
182768	Fedora 37 : exim (2023-0a7690525f)	Nessus	Fedora Local Security Checks	critical
182767	Fedora 38 : exim (2023-42313af0de)	Nessus	Fedora Local Security Checks	critical

Detections

Analytics

CVE-2023-42117

high

Tenable Plugins

high

critical

medium

medium

critical

high

high

high

high

high

critical

critical