Denial of service in Apache Traffic Server

1) Resource exhaustion

EUVDB-ID: #VU29356

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-9494

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources when processing HTTP/2 HEADERS frames. A remote attacker can send specially crafted HTTP/2 requests to the server, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Apache Traffic Server: 6.0.0 - 8.0.7

CPE2.3

• cpe:2.3:a:apache_foundation:apache_ats:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_ats:6.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_ats:6.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_ats:7.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_ats:7.1.10:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_ats:8.0.7:*:*:*:*:*:*:*

External links

https://lists.apache.org/thread.html/rf7f86917f42fdaf904d99560cba0c016e03baea6244c47efeb60ecbe%40%3Cdev.trafficserver.apache.org%3E
https://www.debian.org/security/2020/dsa-4710

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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