#VU48817 Input validation error in Apache Traffic Server - CVE-2020-17509

Vulnerability identifier: #VU48817

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-17509

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Traffic Server
Server applications / Web servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote attacker to perform cache poisoning attacks.

The vulnerability exists due to insufficient validation of user-supplied input in Apache Traffic Server when negative cache option is enabled. A remote attacker can send specially crafted data to the proxy server and poison negative server's cache.

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 - 6.2.3, 7.0.0, 7.1.0 - 7.1.10, 8.0.0 - 8.0.7

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External links
https://lists.apache.org/thread.html/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cdev.trafficserver.apache.org%3E
https://github.com/apache/trafficserver/pull/7359

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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.