PT-2021-19240 · Telegram+2 · Telegram Android+4

Polict · Published 2021-05-18 · Updated 2025-01-19 · CVE-2021-31320

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Name of the Vulnerable Software and Affected Versions Telegram Android versions prior to 7.1.0 (2090) Telegram iOS versions prior to 7.1 Telegram macOS versions prior to 7.1

Description The issue is related to a Heap Buffer Overflow in the VGradientCache::generateGradientColorTable function of the custom fork of the rlottie library. A remote attacker might be able to overwrite heap memory out-of-bounds on a victim device via a malicious animated sticker.

Recommendations For Telegram Android versions prior to 7.1.0 (2090), update to version 7.1.0 (2090) or later. For Telegram iOS versions prior to 7.1, update to version 7.1 or later. For Telegram macOS versions prior to 7.1, update to version 7.1 or later.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-31320

USN-7198-1

Affected Products

Linuxmint

Telegram Android

Telegram Ios

Telegram Macos

Ubuntu

References · 16

• 🔥 https://shielder.it/advisories/telegram-rlottie-vgradientcache-generategradientcolortable-heap-buffer-overflow · Exploit
• 🔥 https://shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-31320 · Security Note
• https://ubuntu.com/security/CVE-2021-31318 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-7198-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31315 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31317 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31320 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7198-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-31320 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31321 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31322 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31320 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-31320 · Security Note
• https://ubuntu.com/security/CVE-2021-31319 · Vendor Advisory