Denial of Service Vulnerability in python-aioxmpp Package
Summary
DEBIAN-CVE-2019-1000007: aioxmpp version 0.10.2 and earlier contains a Improper Handling of Structural Elements vulnerability in Stanza Parser, rollback during error processing, aioxmpp.xso.model.guard function that can result in Denial of Servi... Affects python-aioxmpp versions < 0.10.3-1. Fixed in 0.10.3-1. How to fix ↓
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Background
The python-aioxmpp package is a Python library designed for XMPP (Extensible Messaging and Presence Protocol) communication. It provides tools for building XMPP clients and servers, enabling real-time messaging and presence information. The library is widely used in applications that require instant messaging capabilities. However, versions prior to 0.10.3 are vulnerable to a specific issue that can lead to Denial of Service (DoS) attacks.
Vulnerability Detail
The vulnerability in python-aioxmpp, identified as CVE-2019-1000007, arises from improper handling of structural elements in the Stanza Parser. Specifically, during error processing, the aioxmpp.xso.model.guard function fails to manage certain scenarios correctly. This flaw allows an attacker to send a crafted stanza to an application using the vulnerable library, potentially causing the application to reconnect and lose data. The vulnerability is exploitable remotely, making it a significant risk for applications relying on this library.
How To Fix
Minimum fixed version
0.10.3-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-aioxmppTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider implementing input validation to sanitize incoming stanzas and prevent malformed data from being processed. This may help mitigate the risk of exploitation until the package can be updated.
Conclusion
The python-aioxmpp package has a critical vulnerability that can lead to Denial of Service attacks. It is essential for users of this library to update to the patched version 0.10.3-1 to mitigate risks. Additionally, employing input validation can serve as a temporary measure to protect applications until the update is applied.
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FAQ
CVE-2019-1000007 is a vulnerability in the python-aioxmpp package that can lead to Denial of Service due to improper handling of stanzas.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can result in application crashes, data loss, and service interruptions, impacting user experience.
Yes, the vulnerability has been fixed in version 0.10.3-1 of the python-aioxmpp package.
Implement input validation to sanitize incoming stanzas as a temporary workaround until you can update the package.
References
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