CVE-2022-31095 in discourse-chat
Summary
by MITRE • 06/21/2022
discourse-chat is a chat plugin for the Discourse application. Versions prior to 0.4 are vulnerable to an exposure of sensitive information, where an attacker who knows the message ID for a channel they do not have access to can view that message using the chat message lookup endpoint, primarily affecting direct message channels. There are no known workarounds for this issue, and users are advised to update the plugin.
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Analysis
by VulDB Data Team • 06/22/2022
The vulnerability identified as CVE-2022-31095 affects discourse-chat, a popular chat plugin for the Discourse discussion platform. This issue represents a critical access control flaw that undermines the fundamental security model of the application's messaging system. The vulnerability specifically impacts versions prior to 0.4 of the plugin, where proper authorization checks are missing from the chat message lookup endpoint. Attackers can exploit this weakness by leveraging knowledge of specific message IDs to gain unauthorized access to private direct message channels that should be restricted to authorized participants only.
The technical flaw manifests through a lack of proper authentication and authorization validation within the chat message retrieval mechanism. When an attacker discovers a valid message ID for a direct message channel they should not have access to, the system fails to verify whether the requesting user has legitimate permissions to view that particular message. This represents a classic authorization bypass vulnerability, which can be categorized under CWE-285: Improper Authorization. The vulnerability is particularly concerning because it affects direct message channels where sensitive communications between users would normally be protected by access controls. The absence of proper session validation and user permission checks in the chat message lookup endpoint creates an exploitable path for information disclosure attacks.
The operational impact of this vulnerability extends beyond simple information leakage, as it can lead to severe privacy violations and potential data breaches within collaborative environments where Discourse is deployed. Organizations using this plugin may experience unauthorized access to private conversations, potentially exposing sensitive business communications, personal information, or confidential discussions between users. The vulnerability affects the core messaging functionality of Discourse, undermining trust in the platform's security model and potentially compromising the integrity of user communications. This issue particularly impacts environments where Discourse serves as a primary communication platform for teams, communities, or organizations handling sensitive information.
Security practitioners should prioritize immediate remediation of this vulnerability through updating the discourse-chat plugin to version 0.4 or later, as no effective workarounds exist for this particular flaw. The vulnerability demonstrates the importance of implementing robust access control mechanisms even in specialized plugin components of larger applications. Organizations should conduct comprehensive security assessments of their Discourse installations to identify any potential exploitation attempts and ensure that all users have been updated to secure versions. This vulnerability also highlights the need for continuous security monitoring and patch management processes, particularly for third-party plugins that extend the functionality of core applications. The ATT&CK framework categorizes this issue under T1071.004: Application Layer Protocol: DNS, as it involves exploitation of application-specific protocols and endpoints to gain unauthorized access to data. Organizations should implement network monitoring to detect unusual patterns in chat message lookup requests and establish incident response procedures to address potential exploitation attempts.