Category Archives: Advisories

Multiple Vulnerabilities in Citrix ADC and Gateway Could Allow for Authentication Bypass

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Multiple vulnerabilities have been discovered in Citrix ADC and Gateway, the most severe of which could allow for Authentication Bypass. Citrix ADC and Gateway is an Application Delivery Controller and a gateway service to products respectively. Successful exploitation of the most severe of these vulnerabilities could result in Authentication Bypass. A malicious actor may be able to obtain administrative access. Depending on the permission associated with the application running the exploit, an attacker could then install programs; view, change, or delete data.

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CVE-2021-26391

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Insufficient verification of multiple header signatures while loading a Trusted Application (TA) may allow an attacker with privileges to gain code execution in that TA or the OS/kernel.

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CVE-2021-26392

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Insufficient verification of missing size check in ‘LoadModule’ may lead to an out-of-bounds write potentially allowing an attacker with privileges to gain code execution of the OS/kernel by loading a malicious TA.

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CVE-2021-26393

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Insufficient memory cleanup in the AMD Secure Processor (ASP) Trusted Execution Environment (TEE) may allow an authenticated attacker with privileges to generate a valid signed TA and potentially poison the contents of the process memory with attacker controlled data resulting in a loss of confidentiality.

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