CVE-2021-31318 : Security Advisory and Response

This CVE relates to a type confusion vulnerability found in Telegram Android, iOS, and macOS versions prior to 7.1.0. Attackers could exploit this flaw through a malicious animated sticker to access heap memory out-of-bounds on a victim's device. Read on to understand the impact, technical details, and mitigation strategies.

Understanding CVE-2021-31318

This section delves into the specifics of the CVE-2021-31318 vulnerability.

What is CVE-2021-31318?

CVE-2021-31318 is a type confusion vulnerability affecting Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1. A flaw in the LOTCompLayerItem::LOTCompLayerItem function of the rlottie library allows remote attackers to exploit the issue.

The Impact of CVE-2021-31318

The vulnerability could enable attackers to gain unauthorized access to heap memory out-of-bounds on a victim's device using a specially crafted animated sticker.

Technical Details of CVE-2021-31318

This section outlines the technical details of the CVE-2021-31318 vulnerability.

Vulnerability Description

The vulnerability arises from a type confusion error in the LOTCompLayerItem::LOTCompLayerItem function of the rlottie library, which could be exploited to access heap memory out-of-bounds.

Affected Systems and Versions

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 versions are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malicious animated sticker to a victim, thereby triggering the type confusion flaw.

Mitigation and Prevention

In response to CVE-2021-31318, it's crucial to take immediate action and implement long-term security practices to safeguard against potential threats.

Immediate Steps to Take

Users are advised to update their Telegram applications to versions 7.1.0 or above to mitigate the risk of exploitation.

Long-Term Security Practices

Adopting a proactive approach to cybersecurity, such as regularly updating software and exercising caution when interacting with files and messages, can enhance overall protection.

Patching and Updates

Telegram users should regularly check for updates and apply patches promptly to address security vulnerabilities and enhance the resilience of their devices.