Amazon Linux AMI update for expat

1) XML Entity Expansion

EUVDB-ID: #VU86231

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-2023-52426

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Exploit availability: No

Description

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

The vulnerability exists due to recursive XML Entity Expansion if XML_DTD is undefined at compile time. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    expat-debugsource-2.5.0-1.amzn2023.0.3.aarch64
    expat-debuginfo-2.5.0-1.amzn2023.0.3.aarch64
    expat-2.5.0-1.amzn2023.0.3.aarch64
    expat-static-2.5.0-1.amzn2023.0.3.aarch64
    expat-devel-2.5.0-1.amzn2023.0.3.aarch64

src:
    expat-2.5.0-1.amzn2023.0.3.src

x86_64:
    expat-debugsource-2.5.0-1.amzn2023.0.3.x86_64
    expat-2.5.0-1.amzn2023.0.3.x86_64
    expat-static-2.5.0-1.amzn2023.0.3.x86_64
    expat-debuginfo-2.5.0-1.amzn2023.0.3.x86_64
    expat-devel-2.5.0-1.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

expat: before 2.5.0-1

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:

External links

http://alas.aws.amazon.com/AL2023/ALAS-2024-524.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.