CVE-2021-41157

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Summary

CVECVE-2021-41157
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-10-26 14:15:00 UTC
Updated2022-08-09 13:41:00 UTC
DescriptionFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. By default, SIP requests of the type SUBSCRIBE are not authenticated in the affected versions of FreeSWITCH. Abuse of this security issue allows attackers to subscribe to user agent event notifications without the need to authenticate. This abuse poses privacy concerns and might lead to social engineering or similar attacks. For example, attackers may be able to monitor the status of target SIP extensions. Although this issue was fixed in version v1.10.6, installations upgraded to the fixed version of FreeSWITCH from an older version, may still be vulnerable if the configuration is not updated accordingly. Software upgrades do not update the configuration by default. SIP SUBSCRIBE messages should be authenticated by default so that FreeSWITCH administrators do not need to explicitly set the `auth-subscriptions` parameter. When following such a recommendation, a new parameter can be introduced to explicitly disable authentication.

Risk And Classification

Problem Types: CWE-306

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Freeswitch Freeswitch All All All All

References

ReferenceSourceLinkTags
Full Disclosure: [ES2021-08] FreeSWITCH does not authenticate SIP SUBSCRIBE requests by default FULLDISC seclists.org
[Default-Configuration] Force sip subscription requests to require au… · signalwire/freeswitch@b21dd4e · GitHub MISC github.com
FreeSWITCH does not authenticate SIP SUBSCRIBE requests by default · Advisory · signalwire/freeswitch · GitHub CONFIRM github.com
Release FreeSWITCH v1.10.6 Release · signalwire/freeswitch · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 501957 Alpine Linux Security Update for freeswitch
  • 503928 Alpine Linux Security Update for freeswitch
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