Amazon Linux AMI update for screen



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-24626
CWE-ID CWE-276
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

screen
Operating systems & Components / Operating system package or component

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Incorrect default permissions

EUVDB-ID: #VU77905

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2023-24626

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: Yes

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to missing permissions checks in socket.c, which allows a local user to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

Mitigation

Update the affected packages:

aarch64:
    screen-debuginfo-4.8.0-5.amzn2023.0.3.aarch64
    screen-4.8.0-5.amzn2023.0.3.aarch64
    screen-debugsource-4.8.0-5.amzn2023.0.3.aarch64

src:
    screen-4.8.0-5.amzn2023.0.3.src

x86_64:
    screen-debuginfo-4.8.0-5.amzn2023.0.3.x86_64
    screen-debugsource-4.8.0-5.amzn2023.0.3.x86_64
    screen-4.8.0-5.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

screen: All versions

CPE2.3 External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-224.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. However, proof of concept for this vulnerability is available.



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