CVE-2018-20745 Yii Incorrectly Implements CORS

Medium 5.9 Published Updated

Yii framework incorrectly handles wildcard CORS policies by reflecting arbitrary origins, potentially allowing unauthorized cross-origin requests.

Exploited in the wild
Not known
Login needed
Not needed
Attackable
Over the internet
Victim action needed
Not needed
Fix
Available

What is CVE-2018-20745?

CVE-2018-20745 is a medium-severity vulnerability in n/a, published on 28 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.

Weakness: CWE-346

Which versions are affected by CVE-2018-20745?

2 open source packages ship an affected version, including yiisoft/yii2. It affects 1 product.

PackageAffectedFixed in
yiisoft/yii2 PackagistAll versions2.0.16
yiisoft/yii2 PackagistAll versions2.0.16

Products include Yiiframework Yii.

How do I fix CVE-2018-20745?

Upgrade yiisoft/yii2 to 2.0.16 or later.

Is CVE-2018-20745 being exploited?

There is no known exploitation of CVE-2018-20745 in the wild and no public exploit code.

Sources

Also known as GHSA-cr6r-6xm9-ww22.

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