Vulnerability Details : CVE-2018-20436
Potential exploit
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
Vulnerability category: Server-side request forgery (SSRF)
Products affected by CVE-2018-20436
- cpe:2.3:a:telegram:telegram:4.9.1:*:*:*:*:android:*:*
- cpe:2.3:a:telegram:web:0.7.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-20436
0.48%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-20436
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
8.1
|
HIGH | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST |
CWE ids for CVE-2018-20436
-
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-20436
-
https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html
Capitan Alfa: TELEGRAM (Siempre) In-The-Middle. (CVE-2018-20436)Exploit;Third Party Advisory
-
https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html
Capitan Alfa: Abusando del "Preview" Telegram para conseguir una shell reversaExploit;Third Party Advisory
Jump to