Information disclosure in Eclipse Jetty

1) Input validation error

EUVDB-ID: #VU53973

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28169

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information..

The vulnerability exists due to a double decoding issue when parsing URI with certain characters. A remote attacker can send requests to the ConcatServlet and WelcomeFilter and view contents of protected resources within the WEB-INF directory.

Example:

/concat?/%2557EB-INF/web.xml

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jetty: 9.0.0.v20130308 - 11.0.2

External links

http://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq
http://bugs.eclipse.org/bugs/show_bug.cgi?id=573389

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.