CVE-2019-19781
Scores
EPSS
Percentile: 94.4%
CVSS
CVSS Score: 9.8/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Partial
Measures the impact to the confidentiality of information
Integrity Impact
Partial
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Partial
Measures the impact to the availability of the impacted component
Description
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal.
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Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2019-19781
Source: cisa
URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Recommendations
Source: nvd
Apply an updateCitrix has released updates in Security Bulletin CTX267027. The updated software is designed to prevent unauthenticated attackers from accessing certain web server features. If updates are unavailable for your platform, or if you are otherwise unable to apply updates, please consider the following workarounds:Block the handling of specially-crafted requestsCitrix article CTX267679 contains several mitigation options for this vulnerability, depending on what type of product installation is used. For example, on a stand-alone system, the following commands are reported to mitigate this vulnerability:nable ns feature responderadd responder action respondwith403 respondwith “\“HTTP/1.1 403 Forbidden\r\r\add responder policy ctx267027 “HTTP.REQ.URL.DECODE_USING_TEXT_MODE.CONTAINS(\”/vpns/\“) && (!CLIENT.SSLVPN.IS_SSLVPN || HTTP.REQ.URL.DECODE_USING_TEXT_MODE.CONTAINS(\”/../\“))” respondwith403bind responder global ctx267027 1 END -type REQ_OVERRIDEsave config shell nsapimgr_wr.sh -ys skip_systemaccess_policyeval=0shell “echo ‘nsapimgr_wr.sh -ys skip_systemaccess_policyeval=0’ >> /nsconfig/rc.netscaler”rebootNote that other configurations, such as CLIP, and HA, the steps to mitigate this vulnerability may be different. Please see CTX267679 for more details.Also note that the above mitigation does not work on Citrix ADC Release 12.1 builds before 51.16⁄51.19 and 50.31, due to an altogether different bug. Release 12.1 users are recommended to update to an unaffected build and also apply mitigations for protection.
Vulnerable Software (3)
Type: Configuration
Vendor: citrix
Product: application_delivery_controller_firmware
Operating System: * * *
{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*",
"vulnerable": true
},
...{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:11.1:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:12.0:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:12.1:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:application_delivery_controller_firmware:13.0:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
},
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:h:citrix:application_delivery_controller:-:*:*:*:*:*:*:*"
}
],
"operator": "OR"
}
],
"operator": "AND"
}Source: nvd
Type: Configuration
Vendor: citrix
Product: gateway_firmware
Operating System: * * *
{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:gateway_firmware:13.0:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "...{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:gateway_firmware:13.0:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
},
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:h:citrix:gateway:-:*:*:*:*:*:*:*"
}
],
"operator": "OR"
}
],
"operator": "AND"
}Source: nvd
Type: Configuration
Vendor: citrix
Product: netscaler_gateway_firmware
Operating System: * * *
{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*",
"vulnerable": true
},
{
...{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:netscaler_gateway_firmware:11.1:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:netscaler_gateway_firmware:12.0:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:citrix:netscaler_gateway_firmware:12.1:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
},
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:h:citrix:netscaler_gateway:-:*:*:*:*:*:*:*"
}
],
"operator": "OR"
}
],
"operator": "AND"
}Source: nvd