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Category: Vulnerability Intelligence
Vulnerability Class: Cross-Site Request Forgery (CSRF)
CVE ID: CVE-2023-42027
CVSS Score: 8.8
Product Name
IBM CICS TX Standard 11.1, Advanced 10.1, 11.1, and TXSeries for Multi platforms 8.1, 8.2, 9.1
Executive Summary
CVE-2023-42027 is a cross-site request forgery (CSRF) vulnerability in IBM CICS TX. This vulnerability allows an attacker to execute malicious and unauthorized actions transmitted from a user that the website trusts. The CVSS Base score for this vulnerability is 4.3.
Description:
A CSRF vulnerability occurs when an attacker tricks a user into performing an unwanted action on a website. The attacker does this by sending the user a specially crafted link or email that, when clicked, performs the malicious action. The website is unaware that the user is not authorized to perform the action, and therefore trusts the request.
In the case of CVE-2023-42027, an attacker could send a victim a link that, when clicked, would cause the victim to perform an unauthorized action on a website. For example, the attacker could send the victim a link that would cause them to transfer money from their bank account to the attacker's account.
Impact:
The impact of CVE-2023-42027 can vary depending on the website that is being attacked. However, some potential impacts include:
- Unauthorized data access:An attacker could use a CSRF vulnerability to steal sensitive data from a victim, such as their credit card number or Social Security number.
- Unauthorized financial transactions:An attacker could use a CSRF vulnerability to make unauthorized financial transactions on a victim's behalf, such as transferring money from their bank account to the attacker's account.
- Disruption of service: An attacker could use a CSRF vulnerability to disrupt the service of a website, such as by deleting data or disabling features.
- Unauthorized data access: An attacker could use a CSRF vulnerability to steal sensitive data from a victim, such as their credit card number or Social Security number.
- Unauthorized financial transactions: An attacker could use a CSRF vulnerability to make unauthorized financial transactions on a victim's behalf, such as transferring money from their bank account to the attacker's account.
- Disruption of service: An attacker could use a CSRF vulnerability to disrupt the service of a website, such as by deleting data or disabling features.
Recommended Actions:
The following recommended actions can be taken to mitigate the risk of CVE-2023-42027:
- Install the latest patch from IBM. IBM has released a patch for CVE-2023-42027. All users of IBM CICS TX should install the patch as soon as possible.
- Enable the X-Frame-Options header. This header will prevent the website from being loaded in a frame, which is a common attack vector for CSRF vulnerabilities.
- Implement a content security policy (CSP). A CSP can be used to restrict the types of resources that the website can load, which can help to prevent attackers from injecting malicious code into the website.
Steps to apply the fix manually
To apply the fix for CVE-2023-42027 manually, you can follow the following steps:
- Download the latest patch from IBM.
- Stop the CICS TX server.
- Apply the patch to the CICS TX installation.
- Start the CICS TX server.
Conclusion:
CVE-2023-42027 is a serious vulnerability that can be exploited by attackers to steal data, make unauthorized financial transactions, and disrupt the service of websites. All users of IBM CICS TX should install the latest patch or implement the recommended workarounds as soon as possible.
Is POC available?
At the time of writing this security advisory for CVE-2023-42027, a public proof of concept (POC) has not been released. Security Researchers at Cloudsek are continuously monitoring for any new updates being released on CVE-2023-42027, any further updates will be provided in the same advisory for future references.
CVE-2023-42027 is a remotely exploitable attack, attackers could take advantage of this and exploit vulnerable targets using shodan and google dorks. Affected users are recommended to take the recommended actions mentioned in the above security advisory.
References
* IBM Security X-Force Exchange: CVE-2023-42027: https://exchange.xforce.ibmcloud.com/vulnerabilities/266057
* IBM Support: CVE-2023-42027: https://www.ibm.com/support/pages/node/7063664
