Denial of service in Prosody XMPP server



Published: 2022-01-17 | Updated: 2022-01-19
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-0217
CWE-ID CWE-776
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		Prosody
Server applications / Mail servers

Vendor Prosody

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) XML Entity Expansion

EUVDB-ID: #VU59655

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2022-0217

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Exploit availability: Yes

Description

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

The vulnerability exists due to improper validation of untrusted XML data. A remote attacker can send specially crafted data to the affected server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Prosody: 0.1.0 - 23

External links

http://prosody.im/security/advisory_20220113/


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. However, proof of concept for this vulnerability is available.



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