Amazon Linux AMI update for libX11

1) Out-of-bounds write

EUVDB-ID: #VU77450

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/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-2023-3138

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within src/InitExt.c in libX11. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds write and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    libX11-debuginfo-1.7.2-3.amzn2023.0.3.aarch64
    libX11-xcb-debuginfo-1.7.2-3.amzn2023.0.3.aarch64
    libX11-1.7.2-3.amzn2023.0.3.aarch64
    libX11-xcb-1.7.2-3.amzn2023.0.3.aarch64
    libX11-debugsource-1.7.2-3.amzn2023.0.3.aarch64
    libX11-devel-1.7.2-3.amzn2023.0.3.aarch64

noarch:
    libX11-common-1.7.2-3.amzn2023.0.3.noarch

src:
    libX11-1.7.2-3.amzn2023.0.3.src

x86_64:
    libX11-xcb-debuginfo-1.7.2-3.amzn2023.0.3.x86_64
    libX11-1.7.2-3.amzn2023.0.3.x86_64
    libX11-debuginfo-1.7.2-3.amzn2023.0.3.x86_64
    libX11-xcb-1.7.2-3.amzn2023.0.3.x86_64
    libX11-debugsource-1.7.2-3.amzn2023.0.3.x86_64
    libX11-devel-1.7.2-3.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

libX11: before 1.7.2-3

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*
• cpe:2.3:o:amazon_web_services:libx11:*:*:*:*:*:amazon_linux_ami:*:*

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-250.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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