Advisory Details

November 20th, 2017

systemd Network Name Resolution Manager NSEC Resource Record Pseudo-Types Denial of Service Vulnerability

CVE ID	CVE-2017-15908
CVSS SCORE	7.8, AV:N/AC:L/Au:N/C:N/I:N/A:C
AFFECTED VENDORS	systemd
AFFECTED PRODUCTS	Network Name Resolution Manager
VULNERABILITY DETAILS	This vulnerability allows remote attackers to cause a denial of service condition on vulnerable installations of systemd Network Name Resolution Manager. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of NSEC resource records in systemd-resolved. The issue results from the lack of proper handling of the pseudo-types in the NSEC bitmap which causes an infinite loop. An attacker can leverage this vulnerability to trigger a denial of service condition for the system users.
ADDITIONAL DETAILS	systemd has issued an update to correct this vulnerability. More details can be found at: https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-15908.html
DISCLOSURE TIMELINE	2017-07-25 - Vulnerability reported to vendor 2017-11-20 - Coordinated public release of advisory
CREDIT	Nelson William Gamazo Sanchez - Trend Micro

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