Critical Vulnerability in CUPS Package: Remote Code Execution Risk
Summary
ALPINE-CVE-2024-47175: CUPS is a standards-based, open-source printing system, and libppd can be used for legacy PPD file support. Affects cups versions < 2.4.9-r1. Fixed in 2.4.9-r1. How to fix ↓
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Background
CUPS (Common Unix Printing System) is a standards-based, open-source printing system that allows a computer to act as a print server. It provides a variety of features including support for various printer types, a web-based interface for printer management, and the ability to handle print jobs from multiple clients. The package is widely used in Unix-like operating systems, including Alpine Linux. However, it has been found to contain a vulnerability in the libppd library, which can lead to severe security issues.
Vulnerability Detail
The vulnerability arises from the libppd function ppdCreatePPDFromIPP2, which fails to properly sanitize IPP attributes when creating the PPD buffer. This oversight can be exploited when combined with other functions, such as cfGetPrinterAttributes5, allowing user-controlled input to be processed unsafely. The result can lead to remote code execution (RCE) through an exploit chain, as detailed in CVE-2024-47176. This vulnerability poses a significant risk, especially in environments where CUPS is used to manage printers across a network.
How To Fix
Minimum fixed version
2.4.9-r1
This is the first release that contains the fix.
sudo apk add --upgrade cupsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling the use of the affected functions or restricting access to the CUPS service until the package can be updated. Ensure that only trusted users have access to the printing system to mitigate potential exploitation.
Conclusion
The vulnerability in the CUPS package poses a significant risk of remote code execution due to improper input handling. It is crucial for users and administrators to update their systems to the patched versions to safeguard against potential exploits. Additionally, utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
The vulnerability allows for remote code execution due to improper sanitization of user input in the libppd library.
You can check if your application is affected by using the Vulert playground at Vulert Scanner without any signup.
Exploitation of this vulnerability can lead to unauthorized access and control over the affected system, potentially allowing attackers to execute arbitrary code.
Yes, patches are available in the updated versions of the CUPS package. Make sure to update to the specified versions to mitigate the risk.
If immediate updates are not possible, implement access controls and disable the affected functions as a temporary measure.
References
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