Critical Integer Underflow Vulnerability in rdesktop Package
Summary
ALPINE-CVE-2018-20181: rdesktop versions up to and including v1.8.3 contain an Integer Underflow that leads to a Heap-Based Buffer Overflow in the function seamless_process() and results in memory corruption and probably even a remote code exe... 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 operating systems. It is widely used for remote access to Windows machines, providing features such as seamless window integration and clipboard sharing. However, certain versions of rdesktop are vulnerable to a critical integer underflow issue, which can lead to severe security risks.
Vulnerability Detail
The vulnerability identified as CVE-2018-20181 affects rdesktop versions up to and including v1.8.3. It originates from an integer underflow in the seamless_process() function, which can result in a heap-based buffer overflow. This memory corruption can potentially allow an attacker to execute arbitrary code remotely, posing a significant threat to systems using affected versions of rdesktop.
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
As a temporary workaround, users may consider disabling remote desktop access or using alternative remote access solutions until the package can be updated to a secure version.
Conclusion
The rdesktop package has a critical vulnerability that can lead to remote code execution. Users are strongly advised to update to the patched version 1.8.6-r0 or later to mitigate the risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the security of your applications.
See every vulnerability recorded for rdesktop →
FAQ
CVE-2018-20181 is a critical vulnerability in the rdesktop package that can lead to remote code execution due to an integer underflow.
All versions of rdesktop up to and including v1.8.3 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for this vulnerability is 9.8, indicating a critical level of severity.
If immediate updates are not possible, consider disabling remote desktop access or using alternative solutions until the vulnerability can be addressed.
References
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