CVE-2018-6521 SimpleSAMLphp Use of insecure connection charset (sqlauth module)
Remote attackers can bypass access restrictions in SimpleSAMLphp by exploiting MySQL utf8 charset truncation in the sqlauth module.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-6521?
CVE-2018-6521 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 2 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The sqlauth module in SimpleSAMLphp before 1.15.2 relies on the MySQL utf8 charset, which truncates queries upon encountering four-byte characters. There might be a scenario in which this allows remote attackers to bypass intended access restrictions.
Which versions are affected by CVE-2018-6521?
2 open source packages ship an affected version, including simplesamlphp/simplesamlphp. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
simplesamlphp/simplesamlphp Packagist | All versions | 1.15.2 |
simplesamlphp/simplesamlphp Packagist | All versions | 1.15.2 |
Products include Debian Debian Linux, Simplesamlphp Simplesamlphp.
How do I fix CVE-2018-6521?
Upgrade simplesamlphp/simplesamlphp to 1.15.2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2018-6521 being exploited?
There is no known exploitation of CVE-2018-6521 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2018-6521, GHSA-qv5p-6wrc-79wg, UBUNTU-CVE-2018-6521.