SEOmatic Plugin up to 3.1.3 on Craft CMS Template Request SSTI injection

Summaryinfo

A vulnerability classified as critical was found in SEOmatic Plugin up to 3.1.3 on Craft CMS. The impacted element is an unknown function of the component Template Handler. Executing a manipulation as part of Request can lead to injection (SSTI). This vulnerability appears as CVE-2018-14716. The attack may be performed from remote. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in SEOmatic Plugin up to 3.1.3 on Craft CMS. It has been declared as critical. This vulnerability affects an unknown function of the component Template Handler. The manipulation as part of a Request leads to a injection vulnerability (SSTI). The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A Server Side Template Injection (SSTI) was discovered in the SEOmatic plugin before 3.1.4 for Craft CMS, because requests that don't match any elements incorrectly generate the canonicalUrl, and can lead to execution of Twig code.

The bug was discovered 07/23/2018. The weakness was presented 08/06/2018 as EDB-ID 45108 as not defined exploit (Exploit-DB). The advisory is shared for download at exploit-db.com. This vulnerability was named CVE-2018-14716 since 07/28/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1055.

After immediately, there has been an exploit disclosed. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 14 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.1.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (45108). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• SEOmatic Plugin

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3

License

• open-source

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Once again VulDB remains the best source for vulnerability data.

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