CVE-2018-20436
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 whi…
Published 7 y ago · modified 4 mo ago · JSON
Summary
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
Exploit prediction (EPSS)
1.55% probability of exploitation in the next 30 days, higher than 75% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
- CWE-918 Server-Side Request Forgery
References
- misteralfa-hack.blogspot.com /2018/12/abusando-de-telegram-para-conseguir-una.html · x_refsource_MISC, x_transferred
- misteralfa-hack.blogspot.com /2018/12/telegram-siempre-in-middle.html · x_refsource_MISC, x_transferred
Sources
- CVE List: CVE-2018-20436
- NVD: CVE-2018-20436
vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.