Proxy cache poisonong in Apache Traffic Server

1) Input validation error

EUVDB-ID: #VU48817

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 - Improper input validation

Exploit availability: No

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 update 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/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cdev.trafficserver.apache.org%3E
https://github.com/apache/trafficserver/pull/7359

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.