CVE-2019-16928 : Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

Published 2019-09-27 21:15:10

Updated 2024-07-24 14:24:34

Source MITRE

View at NVD, CVE.org

Vulnerability category: OverflowExecute code

Products affected by CVE-2019-16928

Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 19.04
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 31
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 29
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 30
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Matching versions
Exim » Exim
Versions from including (>=) 4.92 and up to, including, (<=) 4.92.2
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2019-16928

Top countries where our scanners detected CVE-2019-16928

Top open port discovered on systems with this issue 80

IPs affected by CVE-2019-16928 9,648

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2019-16928!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

CVE-2019-16928 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:

Exim Out-of-bounds Write Vulnerability

CISA required action:

Apply updates per vendor instructions.

CISA description:

Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2019-16928

Added on 2022-03-03 Action due date 2022-03-17

Exploit prediction scoring system (EPSS) score for CVE-2019-16928

EPSS FAQ

61.70%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 98 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-16928

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2019-16928

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-16928

https://seclists.org/bugtraq/2019/Sep/60

Bugtraq: [SECURITY] [DSA 4536-1] exim4 security update
Mailing List;Third Party Advisory
https://bugs.exim.org/show_bug.cgi?id=2449

Bug 2449 – Heap Overflow
Issue Tracking;Patch;Vendor Advisory
https://usn.ubuntu.com/4141-1/

USN-4141-1: Exim vulnerability | Ubuntu security notices
Third Party Advisory
https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f

git.exim.org Git - exim.git/commit
Patch
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/

[SECURITY] Fedora 31 Update: exim-4.92.3-1.fc31 - package-announce - Fedora mailing-lists
Release Notes
http://www.openwall.com/lists/oss-security/2019/09/28/4

oss-security - Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow
Mailing List;Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/09/28/2

oss-security - Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow
Exploit;Mailing List;Third Party Advisory
https://www.debian.org/security/2019/dsa-4536

Debian -- Security Information -- DSA-4536-1 exim4
Third Party Advisory
https://security.gentoo.org/glsa/202003-47

Exim: Heap-based buffer overflow (GLSA 202003-47) — Gentoo security
Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/09/28/3

oss-security - Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/

[SECURITY] Fedora 29 Update: exim-4.92.3-1.fc29 - package-announce - Fedora mailing-lists
Release Notes
https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html

[exim-dev] [Bug 2449] New: Heap Overflow
Vendor Advisory
http://www.openwall.com/lists/oss-security/2019/09/28/1

oss-security - Exim CVE-2019-16928 RCE using a heap-based buffer overflow
Exploit;Mailing List;Mitigation;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/

[SECURITY] Fedora 30 Update: exim-4.92.3-1.fc30 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/

[SECURITY] Fedora 31 Update: exim-4.92.3-1.fc31 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/

[SECURITY] Fedora 30 Update: exim-4.92.3-1.fc30 - package-announce - Fedora mailing-lists
Release Notes
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/

[SECURITY] Fedora 29 Update: exim-4.92.3-1.fc29 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

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