National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-20436 Detail

Current Description

** 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.

Source:  MITRE
Description Last Modified:  12/31/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 8.1 HIGH
Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 2.2


Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 6.8 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6


Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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

Technical Details

Vulnerability Type (View All)

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

Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-20436
NVD Published Date:
12/24/2018
NVD Last Modified:
02/14/2019