A vulnerability, which was classified as critical, has been found in Exist up to 5.0.0-RC4. This issue affects an unknown code of the component REST Server. The manipulation as part of a XML Data leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

exist version <= 5.0.0-RC4 contains a XML External Entity (XXE) vulnerability in XML Parser for REST Server that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.

The bug was discovered 09/29/2018. The weakness was presented 12/20/2018 (Website). The advisory is shared at 0dd.zone. The identification of this vulnerability is CVE-2018-1000823 since 12/20/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 82 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• Exist

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• 5.0.0-RC4

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CPE 2.2info

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