USN-7978-1: GNU Screen vulnerabilities

USN-7978-1: GNU Screen vulnerabilities

https://ubuntu.com/security/notices/rss.xml / Tue, 01/27/2026 - 01:59
It was discovered that GNU Screen incorrectly handled signals when setuid or setgid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to send privileged signals, possibly leading to a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2023-24626) It was discovered that GNU Screen incorrectly handled PTY permissions. A local attacker could possibly use this issue to connect to an unauthorized screen session. (CVE-2025-46802) It was discovered that GNU Screen incorrectly handled file access when setuid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to deduce information about certain file paths. (CVE-2025-46804) It was discovered that GNU Screen incorrectly handled signals when setuid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to send privileged signals, possibly leading to a denial of service. (CVE-2025-46805)

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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.