Amazon Linux AMI update for exim

1) Use-after-free

EUVDB-ID: #VU69579

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3559

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in the regex handler. A remote attacker can send specially crafted data to the mail server, trigger a use-after-free error and perform a denial of service (DoS) attack.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update the affected packages:

i686:
    exim-greylist-4.92-1.34.amzn1.i686
    exim-debuginfo-4.92-1.34.amzn1.i686
    exim-pgsql-4.92-1.34.amzn1.i686
    exim-mysql-4.92-1.34.amzn1.i686
    exim-mon-4.92-1.34.amzn1.i686
    exim-4.92-1.34.amzn1.i686

src:
    exim-4.92-1.34.amzn1.src

x86_64:
    exim-mon-4.92-1.34.amzn1.x86_64
    exim-pgsql-4.92-1.34.amzn1.x86_64
    exim-mysql-4.92-1.34.amzn1.x86_64
    exim-greylist-4.92-1.34.amzn1.x86_64
    exim-4.92-1.34.amzn1.x86_64
    exim-debuginfo-4.92-1.34.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

exim: before 4.92-1.34

External links

http://alas.aws.amazon.com/ALAS-2023-1662.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.