CVE-2021-31317

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Type Confusion in the VDasher constructor of their custom fork of the rlottie library. A remote attacker might be able to access Telegram's heap memory out-of-bounds on a victim device via a malicious animated sticker.

Telegram Android versiones anteriores a 7.1,.0 (2090), Telegram iOS versiones anteriores a 7.1, y Telegram macOS versiones anteriores a 7.1, están afectados por una Confusión de Tipos en el constructor de VDasher de su derivación personalizada de la biblioteca rlottie. Un atacante remoto podría acceder a la memoria de la pila de Telegram fuera de límites en un dispositivo víctima por medio de una pegatina animada maliciosa

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-15 CVE Reserved
2021-05-18 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2024-09-20 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://www.shielder.it/advisories/telegram-rlottie-vdasher-vdasher-type-confusion	2024-08-03
https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface	2024-08-03

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Telegram Search vendor "Telegram"		Telegram Search vendor "Telegram" for product "Telegram"				< 7.1.0 Search vendor "Telegram" for product "Telegram" and version " < 7.1.0"		android		Affected
Telegram Search vendor "Telegram"		Telegram Search vendor "Telegram" for product "Telegram"				< 7.1.0 Search vendor "Telegram" for product "Telegram" and version " < 7.1.0"		iphone_os		Affected
Telegram Search vendor "Telegram"		Telegram Search vendor "Telegram" for product "Telegram"				< 7.1.0 Search vendor "Telegram" for product "Telegram" and version " < 7.1.0"		macos		Affected