Amazon Linux AMI update for mod_security

Published: 2023-06-09

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2022-39956 CVE-2022-48279
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system mod_security Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU72089

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39956

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass filtration rules.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set.

Mitigation

Update the affected packages:

i686:
    mlogc-2.8.0-5.28.amzn1.i686
    mod_security-2.8.0-5.28.amzn1.i686
    mod_security-debuginfo-2.8.0-5.28.amzn1.i686

src:
    mod_security-2.8.0-5.28.amzn1.src

x86_64:
    mod_security-2.8.0-5.28.amzn1.x86_64
    mod_security-debuginfo-2.8.0-5.28.amzn1.x86_64
    mlogc-2.8.0-5.28.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

mod_security: before 2.8.0-5.28

External links

http://alas.aws.amazon.com/ALAS-2023-1763.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) Input validation error

EUVDB-ID: #VU72085