CVE-2018-17231 in Telegram
Summary
by MITRE
** DISPUTED ** Telegram Desktop (aka tdesktop) 1.3.14 might allow attackers to cause a denial of service (assertion failure and application exit) via an "Edit color palette" search that triggers an "index out of range" condition. NOTE: this issue is disputed by multiple third parties because the described attack scenario does not cross a privilege boundary.
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Analysis
by VulDB Data Team • 08/05/2024
The vulnerability identified as CVE-2018-17231 affects Telegram Desktop version 1.3.14 and represents a denial of service condition that arises from improper input validation during color palette editing operations. This issue manifests when users interact with the "Edit color palette" search functionality, triggering an assertion failure that results in application termination. The technical root cause stems from an index out of range condition that occurs within the application's handling of user-supplied search parameters, specifically when processing color palette modifications. The flaw demonstrates characteristics consistent with CWE-129, which addresses improper validation of array indices, and CWE-682, which covers incorrect arithmetic operations that can lead to buffer overflows or out-of-bounds access conditions.
The operational impact of this vulnerability extends beyond simple application instability, as it represents a potential vector for service disruption in environments where Telegram Desktop is used as a primary communication tool. When exploited, the vulnerability causes the application to terminate unexpectedly, requiring users to manually restart the client and potentially resulting in loss of unsaved data or communication context. The vulnerability's classification as disputed by multiple third parties stems from the fundamental question of whether this represents a legitimate security concern or merely a usability issue, as the attack scenario does not involve privilege escalation or cross-boundary exploitation. This raises important considerations regarding the distinction between application stability issues and true security vulnerabilities, particularly when the attack vector requires user interaction within the same privilege context.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1499.001, which covers network denial of service attacks, though its application here is more nuanced as it represents an internal application-level denial of service rather than external network-based disruption. The vulnerability's exploitation requires local user interaction, making it less severe from an external threat perspective but still concerning from a user experience and system reliability standpoint. Security practitioners should consider this issue as part of broader application hardening efforts, particularly in environments where stable communication clients are critical for business operations. The vulnerability highlights the importance of robust input validation and proper error handling in client-side applications, especially those handling user-modifiable configuration parameters. Organizations should evaluate their risk tolerance for such stability issues and consider implementing application monitoring and automated restart procedures as part of their operational security measures. The disputed nature of this vulnerability underscores the need for clear criteria in vulnerability classification and the importance of distinguishing between legitimate security concerns and mere application stability defects that may not represent true threats to system integrity.