Critical Integer Overflow Vulnerability in Memcached - CVE-2016-8705
Summary
ALPINE-CVE-2016-8705: Multiple integer overflows in process_bin_update function in Memcached, which is responsible for processing multiple commands of Memcached binary protocol, can be abused to cause heap overflow and lead to remote code exe... Affects memcached versions < 1.4.33-r0. Fixed in 1.4.33-r0. How to fix ↓
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Background
Memcached is a high-performance, distributed memory object caching system, primarily used to speed up dynamic web applications by alleviating database load. It is designed to be simple and efficient, allowing developers to store and retrieve data quickly. However, the package has been found to be vulnerable to multiple integer overflows, which can lead to severe security risks.
Vulnerability Detail
The vulnerability arises from multiple integer overflows in the process_bin_update function of Memcached, which processes commands of the Memcached binary protocol. This flaw can be exploited to cause a heap overflow, potentially allowing an attacker to execute arbitrary code remotely. Given the nature of this vulnerability, it poses a significant risk to systems using affected versions of Memcached, with a CVSS score of 9.8 indicating its critical severity.
How To Fix
Minimum fixed version
1.4.33-r0
This is the first release that contains the fix.
sudo apk add --upgrade memcachedTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, consider disabling the Memcached service until the package can be updated. This can be done using the command: 'rc-service memcached stop'. However, this is not a permanent solution and updating the package is strongly recommended.
Conclusion
The integer overflow vulnerability in Memcached (CVE-2016-8705) poses a significant risk to systems using affected versions. It is crucial to update to the patched version to mitigate potential exploitation. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2016-8705 is a critical vulnerability in Memcached that allows for remote code execution due to integer overflows.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
Not addressing this vulnerability could allow attackers to execute arbitrary code on your server, leading to data breaches or service disruptions.
Yes, Vulert monitors open-source vulnerabilities in real-time using just a manifest file like package-lock.json, providing alerts for any issues.
If immediate updates are not possible, consider stopping the Memcached service as a temporary workaround until you can apply the necessary updates.
References
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