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Denial of service in Apache Traffic Server



Published: 2020-06-29
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-9494
CWE ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Apache Traffic Server
Server applications / Web servers

Vendor Apache Foundation

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource exhaustion

Severity: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-9494

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('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, 6.1.0, 6.1.1, 6.2.0, 6.2.1, 6.2.2, 6.2.3, 7.0.0, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.7, 7.1.8, 7.1.9, 7.1.10, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.7

CPE 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.