CVE-2018-20436

** DISPUTED ** 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.

CVSS v3.0 8.1 HIGH
CVSS v2.0 6.8 MEDIUM

8.1^/10

CVSS v3.0 : HIGH

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

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html	Exploit Third Party Advisory
https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html	Exploit Third Party Advisory

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:telegram:telegram:4.9.1:::::android::
	cpe:2.3:a:telegram:web:0.7.0:::::::*

Information

Published : 2018-12-24 12:29

Updated : 2019-02-14 08:30

NVD link : CVE-2018-20436

Mitre link : CVE-2018-20436

JSON object : View

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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Products Affected

telegram

web
telegram

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