Amazon Linux AMI update for bash

1) Heap-based buffer overflow

EUVDB-ID: #VU71454

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-3715

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in valid_parameter_transform() function in GNU bash. A local user can trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Update the affected packages:

aarch64:
    bash-debuginfo-5.2.15-1.amzn2023.0.2.aarch64
    bash-doc-5.2.15-1.amzn2023.0.2.aarch64
    bash-devel-5.2.15-1.amzn2023.0.2.aarch64
    bash-5.2.15-1.amzn2023.0.2.aarch64
    bash-debugsource-5.2.15-1.amzn2023.0.2.aarch64

src:
    bash-5.2.15-1.amzn2023.0.2.src

x86_64:
    bash-debuginfo-5.2.15-1.amzn2023.0.2.x86_64
    bash-devel-5.2.15-1.amzn2023.0.2.x86_64
    bash-doc-5.2.15-1.amzn2023.0.2.x86_64
    bash-5.2.15-1.amzn2023.0.2.x86_64
    bash-debugsource-5.2.15-1.amzn2023.0.2.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

bash: All versions

CPE2.3

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

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-091.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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