CVE-2017-7540 Safemode Gem Has Incomplete List of Disallowed Inputs
Attackers can bypass Ruby safe mode restrictions to delete unauthorized objects or escalate privileges in applications using the safemode gem.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-7540?
CVE-2017-7540 is a critical vulnerability in Red Hat, Inc. rubygem-safemode, published on 21 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
rubygem-safemode, as used in Foreman, versions 1.3.2 and earlier are vulnerable to bypassing safe mode limitations via special Ruby syntax. This can lead to deletion of objects for which the user does not have delete permissions or possibly to privilege escalation.
Weakness: CWE-184
Which versions are affected by CVE-2017-7540?
2 open source packages ship an affected version, including safemode. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
safemode RubyGems | All versions | 1.3.2 |
safemode RubyGems | All versions | 1.3.2 |
Products include Safemode Project Safemode.
How do I fix CVE-2017-7540?
Upgrade safemode to 1.3.2 or later.
Is CVE-2017-7540 being exploited?
There is no known exploitation of CVE-2017-7540 in the wild and no public exploit code.
Other vulnerabilities in Red Hat, Inc. rubygem-safemode
Sources
Also known as GHSA-5vx5-9q73-wgp4.