Incorrect default permissions in Screen - CVE-2023-24626

Vulnerability identifier: #VU77905

CSH Severity: Low

CVSS v4: 4.8 [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]

CVE-ID: CVE-2023-24626

CWE-ID: CWE-276

Exploitation vector: Local access

Exploit availability: Public exploit is available

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.

Screen
Storage Defender – Data Protect
Amazon Linux AMI
Ubuntu
openEuler
screen (Ubuntu package)
screen
screen-debuginfo
screen-debugsource
screen-help
IBM Content Collector for SAP Applications

Install updates from vendor's website.

screen (Ubuntu package) - update to Ubuntu Pro
Storage Defender – Data Protect - update to 2.0
screen - update to 4.8.0-4
screen-debuginfo - update to 4.8.0-4
screen-debugsource - update to 4.8.0-4
screen-help - update to 4.8.0-4
screen - update to 4.8.0-5
IBM Content Collector for SAP Applications - update to 21.0.3 IF027

• Exploit #10744 - GNU screen v4.9.0 - Privilege Escalation (October 25, 2024)

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

• Local denial of service in GNU Screen
• Ubuntu update for screen
• IBM Content Collector for SAP Component update for GNU screen library
• Multiple vulnerabilities in IBM Storage Defender - Data Protect
• openEuler update for screen
• Amazon Linux AMI update for screen