CVE-2018-6557

The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.

• CWE-59

• http://www.securityfocus.com/bid/105148Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1041530Broken Link, Third Party Advisory, VDB Entry
• https://usn.ubuntu.com/3748-1/Vendor Advisory
• http://www.securityfocus.com/bid/105148Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1041530Broken Link, Third Party Advisory, VDB Entry
• https://usn.ubuntu.com/3748-1/Vendor Advisory

Published

Aug 21, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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