CVE-2022-26656 in Infinity
Summary
by MITRE • 07/18/2022
Pexip Infinity before 27.3 allows remote attackers to trigger a software abort, and possibly enumerate usernames, via One Touch Join.
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Analysis
by VulDB Data Team • 08/01/2022
CVE-2022-26656 represents a significant vulnerability in Pexip Infinity versions prior to 27.3 that exposes the system to remote exploitation through the One Touch Join functionality. This vulnerability falls under the category of improper error handling and potentially information disclosure, with implications that extend beyond simple service disruption. The flaw allows remote attackers to trigger a software abort condition that can lead to system instability and potentially enable username enumeration attacks. The vulnerability is particularly concerning because it leverages a legitimate user feature to create a vector for both denial of service and reconnaissance activities.
The technical implementation of this vulnerability occurs within the One Touch Join mechanism which is designed to provide simplified access to conference sessions. When an attacker submits malformed or specially crafted requests through this interface, the system fails to properly validate input parameters and handle exceptional conditions. This inadequate error handling results in the triggering of a software abort, which essentially forces the application to terminate unexpectedly. The abort condition can be exploited repeatedly to cause sustained service disruption, while the inconsistent error responses during the abort process may inadvertently reveal information about valid user accounts within the system. This behavior aligns with CWE-248, which addresses "Uncaught Exception" conditions where applications fail to properly handle exceptional circumstances.
The operational impact of CVE-2022-26656 extends beyond immediate service availability concerns to encompass potential reconnaissance activities that could facilitate more sophisticated attacks. Attackers can leverage the username enumeration capability to build comprehensive lists of valid accounts within the Pexip Infinity environment, which subsequently enables targeted credential stuffing attacks or password spraying techniques. The vulnerability's remote exploitability means that threat actors can initiate attacks from anywhere on the internet without requiring physical access or local network privileges, making it particularly attractive for automated attack campaigns. Organizations using affected versions face the risk of unauthorized access to sensitive communication sessions and potential data exposure through compromised user accounts. The attack surface is further expanded by the fact that this vulnerability affects the core conference joining functionality that is typically accessible to external users.
Mitigation strategies for CVE-2022-26656 should prioritize immediate software updates to Pexip Infinity version 27.3 or later, which contain the necessary patches to address the improper error handling conditions. Network segmentation and access controls should be implemented to limit exposure of the One Touch Join functionality to trusted networks only, while monitoring systems should be configured to detect unusual patterns of abort conditions or enumeration attempts. The implementation of rate limiting and input validation controls can help reduce the effectiveness of automated exploitation attempts, and regular security assessments should be conducted to identify similar vulnerabilities in other system components. Organizations should also consider implementing intrusion detection systems that can identify and alert on patterns consistent with CVE-2022-26656 exploitation attempts, as the behavior of the abort condition and username enumeration can be distinctive enough to be detected through network traffic analysis. This vulnerability demonstrates the importance of proper exception handling in security-critical applications and aligns with ATT&CK technique T1210 for exploitation of remote services, while also potentially supporting credential access through T1565 for data manipulation and T1589 for reconnaissance activities.