CVE-2014-4994 Gyazo allows local users to write arbitrary files
Local attackers can overwrite arbitrary files via symlink attacks on temporary files in the gyazo Ruby gem.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2014-4994?
CVE-2014-4994 is a medium-severity path traversal vulnerability in n/a, published on 10 Jan 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
lib/gyazo/client.rb in the gyazo gem 1.0.0 for Ruby allows local users to write to arbitrary files via a symlink attack on a temporary file, related to time-based filenames.
Weakness: CWE-20
Which versions are affected by CVE-2014-4994?
2 open source packages ship an affected version, including gyazo. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gyazo RubyGems | From 1.0.0 | 2.0.0 |
gyazo RubyGems | From 1.0.0 | 2.0.0 |
Products include Gyazo Project Gyazo.
How do I fix CVE-2014-4994?
Upgrade gyazo to 2.0.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2014-4994 being exploited?
There is no known exploitation of CVE-2014-4994 in the wild and no public exploit code.
Sources
Also known as GHSA-6x45-86q6-rcmr.