CVE-2017-15908

Publication date 26 October 2017

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
systemd 17.10 artful
Fixed 234-2ubuntu12.1
17.04 zesty
Fixed 232-21ubuntu7.1
16.04 LTS xenial
Fixed 229-4ubuntu21.1
14.04 LTS trusty
Not affected

Notes

mdeslaur

resolve only used by default on zesty+ independently discovered by Nelson William Gamazo Sanchez, working with Trend Micro's Zero Day Initiative

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
systemd

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3558-1
    • systemd vulnerabilities
    • 5 February 2018
    • USN-3466-1
    • systemd vulnerability
    • 26 October 2017

Other references