CVE-2021-1725 in Bot Framework SDK
Summary
by MITRE • 01/13/2021
Bot Framework SDK Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 10/09/2024
The CVE-2021-1725 vulnerability represents a critical information disclosure flaw within the Microsoft Bot Framework SDK that affects developers integrating conversational AI capabilities into their applications. This vulnerability stems from improper handling of sensitive data during the bot communication process, specifically when the SDK fails to adequately sanitize or encrypt information transmitted between bot services and users. The flaw exists in the authentication and authorization mechanisms that govern how bot frameworks process incoming requests and manage session data, creating potential exposure points for confidential information.
The technical implementation of this vulnerability resides in the way the Bot Framework SDK manages token validation and credential handling within its middleware components. When bots process incoming messages or authentication requests, the system does not sufficiently validate or sanitize the data flow, allowing attackers to potentially extract sensitive information such as authentication tokens, user session data, or other confidential parameters that should remain protected. This weakness is particularly concerning as it operates at the protocol level where security boundaries are typically enforced, making it difficult to detect through standard network monitoring.
The operational impact of this vulnerability extends beyond simple data exposure, as it creates opportunities for attackers to escalate privileges and gain unauthorized access to bot services. An attacker exploiting this flaw could potentially impersonate legitimate users or gain access to backend systems that rely on the bot framework for authentication. The vulnerability affects organizations using Microsoft Bot Framework SDK versions prior to the patched release, particularly those implementing bots for customer service, automated responses, or enterprise communication platforms. This creates widespread risk across industries including finance, healthcare, and government sectors where bot systems handle sensitive personal information.
Security professionals should implement immediate mitigations including updating to the latest Bot Framework SDK versions that contain patches addressing the information disclosure issue. Organizations must also review their bot implementations for proper input validation and ensure that all authentication tokens are properly sanitized before being processed or logged. The vulnerability aligns with CWE-200, which addresses information exposure through improper information handling, and maps to ATT&CK technique T1566 for social engineering via compromised credentials. Additional defensive measures include implementing network segmentation, monitoring for unusual authentication patterns, and conducting regular security assessments of bot frameworks to identify potential information leakage points.