CVE-2018-17785 In blynk-server a Directory Traversal exists
An attacker can read arbitrary files on the server by exploiting a directory traversal vulnerability in the Blynk server's static file handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-17785?
CVE-2018-17785 is a high-severity path traversal vulnerability in n/a, published on 30 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In blynk-server in Blynk before 0.39.7, Directory Traversal exists via a ../ in a URI that has /static or /static/js at the beginning, as demonstrated by reading the /etc/passwd file.
Weakness: CWE-22
Which versions are affected by CVE-2018-17785?
2 open source packages ship an affected version, including com.github.blynkkk:blynk-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.github.blynkkk:blynk-server Maven | All versions | 0.39.7 |
com.github.blynkkk:blynk-server Maven | All versions | 0.39.7 |
Products include Blynk Blynk-Server.
How do I fix CVE-2018-17785?
Upgrade com.github.blynkkk:blynk-server to 0.39.7 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2018-17785 being exploited?
There is no known exploitation of CVE-2018-17785 in the wild and no public exploit code.
Sources
Also known as GHSA-4r64-wf76-c53p.