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Vulnerability Details : CVE-2021-41105

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. When handling SRTP calls, FreeSWITCH prior to version 1.10.7 is susceptible to a DoS where calls can be terminated by remote attackers. This attack can be done continuously, thus denying encrypted calls during the attack. When a media port that is handling SRTP traffic is flooded with a specially crafted SRTP packet, the call is terminated leading to denial of service. This issue was reproduced when using the SDES key exchange mechanism in a SIP environment as well as when using the DTLS key exchange mechanism in a WebRTC environment. The call disconnection occurs due to line 6331 in the source file `switch_rtp.c`, which disconnects the call when the total number of SRTP errors reach a hard-coded threshold (100). By abusing this vulnerability, an attacker is able to disconnect any ongoing calls that are using SRTP. The attack does not require authentication or any special foothold in the caller's or the callee's network. This issue is patched in version 1.10.7.
Publish Date : 2021-10-25 Last Update Date : 2021-10-28
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID CWE id is not defined for this vulnerability

- Products Affected By CVE-2021-41105

# Product Type Vendor Product Version Update Edition Language
1 Application Freeswitch Freeswitch * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Freeswitch Freeswitch 1

- References For CVE-2021-41105

http://seclists.org/fulldisclosure/2021/Oct/43
FULLDISC 20211026 [ES2021-09] FreeSWITCH susceptible to Denial of Service via invalid SRTP packets
https://github.com/signalwire/freeswitch/security/advisories/GHSA-jh42-prph-gp36 CONFIRM
https://github.com/signalwire/freeswitch/releases/tag/v1.10.7

- Metasploit Modules Related To CVE-2021-41105

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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