CVE - CVE-2021-41105

CVE-ID
CVE-2021-41105	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/signalwire/freeswitch/security/advisories/GHSA-jh42-prph-gp36 URL:https://github.com/signalwire/freeswitch/security/advisories/GHSA-jh42-prph-gp36 FULLDISC:20211026 [ES2021-09] FreeSWITCH susceptible to Denial of Service via invalid SRTP packets URL:http://seclists.org/fulldisclosure/2021/Oct/43 MISC:https://github.com/signalwire/freeswitch/releases/tag/v1.10.7 URL:https://github.com/signalwire/freeswitch/releases/tag/v1.10.7
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20210915	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210915)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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