Microsoft is investigating two reported zero-day vulnerabilities affecting Microsoft Exchange Server 2013, 2016, and 2019. The first vulnerability, identified as CVE-2022-41040, is a Server-Side Request Forgery (SSRF) vulnerability, while the second, identified as CVE-2022-41082, allows remote code execution (RCE) when PowerShell is accessible to the attacker.
What Customers Should Do
To protect your on-prem Exchange you can bind a responder policy on the Citrix ADC contentswitch handling all the Exchange related traffic:
Vulnerabilities have been discovered in Citrix Application Delivery Management (Citrix ADM) that, if exploited, could result in the following security issues:
Corruption of the system by a remote, unauthenticated user. The impact of this can include the reset of the administrator password at the next device reboot, allowing an attacker with ssh access to connect with the default administrator credentials after the device has rebooted.
Temporary disruption of the ADM license service. The impact of this includes preventing new licenses from being issued or renewed by Citrix ADM.
CVE-ID
Description
CWE
Pre-conditions
CVE-2022-27511
Corruption of the system by a remote, unauthenticated user potentially leading to the reset of the administrator password
CWE-284: Improper Access Control
Access to ADM IP
CVE-2022-27512
Temporary disruption of the ADM license service
CWE-664: Improper Control of a Resource Through its Lifetime
Access to ADM IP
Da der ADM Zugangsdaten & Zugriff auf die konfigurierten Instanzen hat, wird empfohlen die Sicherheitslücke rasch zu schliessen in dem die ADM Instanz auf eine der folgenden Versionen aktualisiert wird:
Citrix ADM 13.1-21.53 and later versions of 13.1
Citrix ADM 13.0-85.19 and later versions of 13.0
Als Mitigation kann versucht werden die ADM Management IP über eine Firewall zu sperren.
Normalerweise ist das ADM nur von intern zugänglich wodurch das Risiko einer Ausnutzung der Schwachstelle relativ klein ist. Ein Angreifer müsste bereits Zugang zum internen Netz haben. Wie die Schwachstelle ausgenutzt werden kann ist bisher unbekannt.
Für detaillierte Informationen und weitere Schritte, folgen Sie bitte den Informationen im Original Citrix Artikel. Gerne unterstützen wir Sie bei bedarf bei dem Update.
A vulnerability has been discovered in Citrix Gateway Plug-in for Windows (Citrix Secure Access for Windows). If exploited, this issue would allow an adversary, who has gained local access to a computer with Citrix Gateway Plug-in installed, to corrupt or delete files as SYSTEM. This issue has the following identifier:
CVE-ID
Description
CWE
Pre-conditions
CVE-2022-21827
Arbitrary corruption or deletion of files as SYSTEM
CWE-284: Improper Access Control
Local access to a machine that has the vulnerable plug-in installed
The following supported versions of Citrix Gateway Plug-in for Windows (Citrix Secure Access for Windows) are affected by this vulnerability:
Citrix Gateway Plug-in for Windows versions before 21.9.1.2
What Customers Should Do
This issue has been addressed in the following versions of Citrix Gateway Plug-in for Windows (Citrix Secure Access for Windows):
Citrix Gateway Plug-in for Windows version 21.9.1.2 and later releases
Google Chrome hat nach kurzer Zeit eine neue Aktualisierung des Chrome Browsers zur Verfügung gestellt. Die neue Version schliesst wieder eine Lücke in der JavaScript Engine V8 (Type Confusion» (CVE-2022-1232). Google stuft die Lücke als «hoch» ein.
Google hat hierzu die Version «100.0.4896.75» für Windows, Linux und Mac veröffentlicht. Microsoft hat ebenfalls eine neue Version des Chromium basierenden Edge Browser veröffentlicht.
A zero-day exploit affecting the Spring Framework versions (5.3.0 to 5.3.17, 5.2.0 to 5.2.19, and older versions was made public on March 30, 2022, allowing an unauthenticated attacker to execute arbitrary code on the target system.
Citrix recommends that customers hosting affected web applications follow Spring’s recommendations. In addition, Citrix Web App Firewall (WAF) customers should consider the following recommendations to improve the security of their applications from this vulnerability.
The Citrix research team has released updated Citrix WAF signatures designed to mitigate in part the CVE-2022-22963, CVE-2022-22965 vulnerability. If you are using any of these Spring Framework versions (5.3.0 to 5.3.17, 5.2.0 to 5.2.19, and older versions), Citrix strongly recommends that you download the signatures version 79 and apply to your Citrix WAF deployments as an additional layer of protection for your applications. Signatures are compatible with the following software versions of Citrix Application Delivery Controller (ADC) 11.1, 12.0, 12.1, 13.0 and 13.1. Please note, versions 11.1 and 12.0 are end of life.
Citrix ADC Produkte sind selber nicht von der Sicherheitslücke betroffen.
Für alle Kunden, welche WAF nicht im Einsatz haben, gibt es auch eine Empfehlung seitens Citrix, die Sicherheitslücke mittels Responder Policy zu minimieren:
Citrix ADC Standard and Advanced edition customers, as well as Premium edition customers who do not have WAF signatures enabled, can use responder policies for protection as shown below. Please bind the responder policy to the appropriate bind point (vserver or global).
add responder policy mitigate_cve_2022_22963_22965 q^(HTTP.REQ.FULL_HEADER. SET_TEXT_MODE(URLENCODED).DECODE_USING_TEXT_MODE.
CONTAINS("spring.cloud.function.routing-expression") || HTTP.REQ.BODY(8192).SET_TEXT_MODE(URLENCODED).DECODE_USING_TEXT_MODE.CONTAINS(".classLoader"))^ DROP
Citrix recommends that Citrix WAF customers use the latest signature version, enable signatures auto-update, and subscribe to receive signature alert notifications. Citrix will continue to monitor this dynamic situation and update as new mitigations become available.
If any of your application availability is inadvertently impacted due to false positives resulting from above mentioned mitigation policies, Citrix recommends the following modifications to the policy. Please note that any end point covered by the exception_list may expose those assets to the risks from CVE-2022-22963, CVE-2022-22965.
