Amazon Linux AMI update for libX11

1) Double Free

EUVDB-ID: #VU46027

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-2020-14363

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when handling locales in LibX11. A local user can run a specially crafted program to trigger integer overflow and double free and execute arbitrary code on the system with elevated privileges.

Mitigation

Update the affected packages:

i686:
    libX11-common-1.6.0-2.2.13.amzn1.i686
    libX11-devel-1.6.0-2.2.13.amzn1.i686
    libX11-1.6.0-2.2.13.amzn1.i686
    libX11-debuginfo-1.6.0-2.2.13.amzn1.i686

src:
    libX11-1.6.0-2.2.13.amzn1.src

x86_64:
    libX11-1.6.0-2.2.13.amzn1.x86_64
    libX11-common-1.6.0-2.2.13.amzn1.x86_64
    libX11-debuginfo-1.6.0-2.2.13.amzn1.x86_64
    libX11-devel-1.6.0-2.2.13.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-2021-1462.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.