CVE-2019-12739 Command injection in n/a
Remote attackers can execute arbitrary code on Nextcloud servers by injecting shell metacharacters into RAR filenames processed by the Extract add-on.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2019-12739?
CVE-2019-12739 is a critical command injection vulnerability in n/a, published on 5 Jun 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
lib/Controller/ExtractionController.php in the Extract add-on before 1.2.0 for Nextcloud allows Remote Code Execution via shell metacharacters in a RAR filename via ajax/extractRar.php (nameOfFile and directory parameters).
Weakness: CWE-78
Which versions are affected by CVE-2019-12739?
It affects 1 product.
Products include Nextcloud Extract.
How do I fix CVE-2019-12739?
No fix has been published for CVE-2019-12739 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2019-12739 being exploited?
There is no known exploitation of CVE-2019-12739 in the wild and no public exploit code.
Sources
Also known as CVE-2019-5441, GHSA-vpwh-6v3v-q9vw.