Critical Integer Overflow Vulnerability in rdesktop Package
Summary
ALPINE-CVE-2018-8794: rdesktop versions up to and including v1.8.3 contain an Integer Overflow that leads to an Out-Of-Bounds Write in function process_bitmap_updates() and results in a memory corruption and possibly even a remote code execut... Affects rdesktop versions < 1.8.6-r0. Fixed in 1.8.6-r0. How to fix ↓
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Background
rdesktop is an open-source client for the Remote Desktop Protocol (RDP), allowing users to connect to Windows desktops from Unix-like systems. It supports various features such as sound redirection, clipboard sharing, and multiple session management. However, versions up to and including v1.8.3 are vulnerable to a critical integer overflow issue that can lead to severe security risks.
Vulnerability Detail
The vulnerability arises from an integer overflow in the function process_bitmap_updates() within rdesktop. This flaw can lead to an out-of-bounds write, resulting in memory corruption. The potential ramifications include remote code execution, where an attacker could exploit this vulnerability to execute arbitrary code on the affected system, compromising its integrity and confidentiality.
How To Fix
Minimum fixed version
1.8.6-r0
This is the first release that contains the fix.
sudo apk add --upgrade rdesktopTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider disabling remote desktop access temporarily until the package can be updated. Additionally, implement network-level security measures such as firewalls to restrict access to the affected service.
Conclusion
The rdesktop package has a critical vulnerability due to an integer overflow that can lead to severe security implications, including remote code execution. It is essential to update to the patched version 1.8.6-r0 or later to mitigate these risks. Users are encouraged to monitor their systems for vulnerabilities using tools like Vulert.
See every vulnerability recorded for rdesktop →
FAQ
The CVSS score of this vulnerability is 9.8, indicating a critical level of severity.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
The risks include potential remote code execution, which could allow attackers to gain unauthorized access to your system and execute malicious actions.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If you cannot update the package, consider disabling remote desktop access and implementing additional security measures to protect your system.
References
Related vulnerabilities
Recent vulnerabilities recorded for rdesktop.
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