Vulnerability identifier: #VU20337

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9515

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in HTTP/2 implementation when processing SETTINGS frames. A remote attacker can send a huge amount of  SETTINGS frames to the peer and consume excessive CPU and memory on the system.

Mitigation
Install updates from vendor's website.

External links
http://seclists.org/fulldisclosure/2019/Aug/16
http://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
http://kb.cert.org/vuls/id/605641/
http://lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030254c04@%3Cusers.trafficserver.apache.org%3E
http://lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d34b3c19@%3Cannounce.trafficserver.apache.org%3E
http://lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0eee0a7@%3Cdev.trafficserver.apache.org%3E
http://seclists.org/bugtraq/2019/Aug/24
http://www.synology.com/security/advisory/Synology_SA_19_33

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.