#VU73158 Off-by-one in Drachtio Server - CVE-2022-47517

Vulnerability identifier: #VU73158

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-47517

CWE-ID: CWE-193

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drachtio Server
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: drachtio

Description

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

The vulnerability exists due to a boundary error in url_canonize2() when processing UDP packets. A remote attacker can send a specially crafted UDP request to the server, trigger an off-by-one error and crash it.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Drachtio Server: 0.2.0 - 0.8.18

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External links
https://github.com/davehorton/sofia-sip/commit/22c1bd191f0acbf11f0c0fbea1845d9bf9dcd47e
https://github.com/davehorton/sofia-sip/commit/bfc79d85c8f3a4798a3305fb98f5a11c11d0d29f
https://github.com/drachtio/drachtio-server/issues/243

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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.