PT-2020-6438 · Telegram+2 · Telegram Android+4

Polict · Published 2020-09-21 · Updated 2025-01-10 · CVE-2021-31317

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Telegram Android versions 7.0 through 7.0 (2090) Telegram iOS versions prior to 7.1 Telegram macOS versions prior to 7.1

Description The issue is related to type confusion errors in the VDasher constructor of the custom rlottie library used for Lottie animation playback. Exploitation of this issue could allow a remote attacker to access confidential data by using a malicious animated sticker, potentially leading to out-of-bounds access to the heap memory on a victim's device.

Recommendations For Telegram Android versions 7.0 through 7.0 (2090), update to version 7.1.0 (2091) 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

Type Confusion

Weakness Enumeration

CWE-843

Related Identifiers

BDU:2021-04690

CVE-2021-31317

USN-7198-1

Affected Products

Linuxmint

Telegram Android

Telegram Ios

Telegram Macos

Ubuntu

References · 18

• 🔥 https://shielder.it/advisories/telegram-rlottie-vdasher-vdasher-type-confusion · 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-2021-31317 · Security Note
• https://ubuntu.com/security/CVE-2021-31318 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31315 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31317 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04690 · Security Note
• https://ubuntu.com/security/CVE-2021-31321 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31322 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31317 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-31317 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-7198-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31320 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-31317 · Security Note
• https://osv.dev/vulnerability/USN-7198-1 · Vendor Advisory