Amazon Linux AMI update for expat

1) Resource exhaustion

EUVDB-ID: #VU59642

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-45960

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources in the storeAtts() function in xmlparse.c. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

i686:
    expat-2.1.0-12.28.amzn1.i686
    expat-debuginfo-2.1.0-12.28.amzn1.i686
    expat-devel-2.1.0-12.28.amzn1.i686

src:
    expat-2.1.0-12.28.amzn1.src

x86_64:
    expat-debuginfo-2.1.0-12.28.amzn1.x86_64
    expat-devel-2.1.0-12.28.amzn1.x86_64
    expat-2.1.0-12.28.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

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

External links

https://alas.aws.amazon.com/ALAS-2022-1588.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.