Local denial of service in GNU Screen



Published: 2023-07-03
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-24626
CWE-ID CWE-276
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		Screen
Other software / Other software solutions

Vendor GNU

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Incorrect default permissions

EUVDB-ID: #VU77905

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-24626

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

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

Install updates from vendor's website.

Vulnerable software versions

Screen: 4.0.1 - 4.9.0

External links

http://git.savannah.gnu.org/cgit/screen.git/patch/?id=e9ad41bfedb4537a6f0de20f00b27c7739f168f7
http://www.exploit-db.com/exploits/51252
http://savannah.gnu.org/bugs/?63195


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.



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