CVE-2018-20436

Severity Score

8.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The "secret chat" feature in Telegram 4.9.1 for Android has a "side channel" in which Telegram servers send GET requests for URLs typed while composing a chat message, before that chat message is sent. There are also GET requests to other URLs on the same web server. This also affects one or more other Telegram products, such as Telegram Web-version 0.7.0. In addition, it can be interpreted as an SSRF issue. NOTE: a third party has reported that potentially unwanted behavior is caused by misconfiguration of the "Secret chats > Preview links" setting

**EN DISPUTA** La funcionalidad de "chat secreto" en la versión 4.9.1 de Telegram para Android tiene un "canal lateral" a través del cual servidores Telegram envían peticiones GET para URL tipadas mientras redactan un mensaje de chat antes de enviarlo. Hay, también, peticiones GET a otras URL en el mismo servidor web. Esto también afecta a uno o más productos Telegram, como puede ser la versión web 0.7.0 de Telegram. Además, puede interpretarse como un problema de Server-Side Request Forgery (SSRF). NOTA: un tercero ha reportado que comportamientos potencialmente no deseados son causados por la mala configuración del ajuste de "chats secretos > Previsualización de enlaces".

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-12-24 CVE Reserved
2018-12-24 CVE Published
2024-05-16 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-918: Server-Side Request Forgery (SSRF)

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html	2024-08-05
https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html	2024-08-05

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"				4.9.1 Search vendor "Telegram" for product "Telegram" and version "4.9.1"		android		Affected
Telegram Search vendor "Telegram"		Web Search vendor "Telegram" for product "Web"				0.7.0 Search vendor "Telegram" for product "Web" and version "0.7.0"		-		Affected