Amazon Linux AMI update for exim

Published: 2023-10-25

Risk	Critical
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-42116 CVE-2023-42117
CWE-ID	CWE-121 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system exim Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Stack-based buffer overflow

EUVDB-ID: #VU81253

Risk: Critical

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red]

CVE-ID: CVE-2023-42116

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling NTLM challenge requests. A remote unauthenticated attacker can send specially crafted data to the server, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Update the affected packages:

i686:
    exim-pgsql-4.92-1.39.amzn1.i686
    exim-debuginfo-4.92-1.39.amzn1.i686
    exim-mon-4.92-1.39.amzn1.i686
    exim-mysql-4.92-1.39.amzn1.i686
    exim-greylist-4.92-1.39.amzn1.i686
    exim-4.92-1.39.amzn1.i686

src:
    exim-4.92-1.39.amzn1.src

x86_64:
    exim-4.92-1.39.amzn1.x86_64
    exim-mon-4.92-1.39.amzn1.x86_64
    exim-mysql-4.92-1.39.amzn1.x86_64
    exim-pgsql-4.92-1.39.amzn1.x86_64
    exim-debuginfo-4.92-1.39.amzn1.x86_64
    exim-greylist-4.92-1.39.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

exim: before 4.92-1.39

CPE2.3

External links

https://alas.aws.amazon.com/ALAS-2023-1860.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Buffer overflow

EUVDB-ID: #VU81254