CVE-2021-31315 : What You Need to Know

This article provides detailed information about CVE-2021-31315, a vulnerability affecting Telegram Android, iOS, and macOS versions prior to 7.1.0, 7.1, and 7.1 respectively.

Understanding CVE-2021-31315

This section delves into the nature of the CVE-2021-31315 vulnerability.

What is CVE-2021-31315?

CVE-2021-31315 affects Telegram applications on Android, iOS, and macOS, leading to a Stack Based Overflow in the blit function of their customized rlottie library. Attackers can exploit this flaw to access Telegram's stack memory out-of-bounds using a malicious animated sticker.

The Impact of CVE-2021-31315

The vulnerability poses a risk to users of affected Telegram versions, potentially allowing remote attackers to compromise stack memory on victim devices.

Technical Details of CVE-2021-31315

This section provides technical insights into the CVE-2021-31315 vulnerability.

Vulnerability Description

The vulnerability arises from a Stack Based Overflow in the blit function of rlottie library in Telegram's Android, iOS, and macOS applications.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit the vulnerability through a malicious animated sticker, allowing them to access Telegram's stack memory out-of-bounds on targeted devices.

Mitigation and Prevention

In this section, we discuss the mitigation strategies and preventive measures for CVE-2021-31315.

Immediate Steps to Take

Users are advised to update their Telegram applications to versions equal to or above 7.1 on Android, iOS, and macOS platforms to mitigate the risk associated with this vulnerability.

Long-Term Security Practices

Maintaining the timely update of applications and using security software can help enhance protection against potential threats.

Patching and Updates

Regularly checking for security updates from Telegram and promptly applying patches is crucial in safeguarding devices against vulnerabilities like CVE-2021-31315.