CVE-2017-15908

Description

In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS NSEC resource record to trigger an infinite loop in the dns_packet_read_type_window() function of the 'systemd-resolved' service and cause a DoS of the affected service.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
• v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.27%• Percentile: 50%

Techniques & Countermeasures

• CWE-835•Loop with Unreachable Exit Condition ('Infinite Loop')

  The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Systems

• canonical•ubuntu_linux

  14.04 | 16.04

• systemd_project•systemd

  223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | 232 | 233 | 234 | 235

References (5)

• http://www.securitytracker.com/id/1039662
• http://www.securityfocus.com/bid/101600
• https://github.com/systemd/systemd/pull/7184
• https://usn.ubuntu.com/3558-1/
• https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1725351