Apache HTTP Server Vulnerability: Uninitialized Memory Exposure in mod_proxy_ftp
Summary
ALPINE-CVE-2020-1934: In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server. Affects apache2 versions < 2.4.43-r0. Fixed in 2.4.43-r0. How to fix ↓
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Background
Apache HTTP Server is a widely-used open-source web server software that enables the hosting of websites and web applications. It is known for its flexibility, power, and extensive module support, allowing users to customize server behavior. However, certain versions of Apache HTTP Server, specifically from 2.4.0 to 2.4.41, are vulnerable to a security issue in the mod_proxy_ftp module, which can lead to the exposure of uninitialized memory when proxying requests to malicious FTP servers.
Vulnerability Detail
The vulnerability, identified as CVE-2020-1934, arises from the way mod_proxy_ftp handles responses from FTP servers. When proxying to a malicious FTP server, the module may inadvertently use uninitialized memory, potentially exposing sensitive data. This could allow an attacker to read memory contents that should not be accessible, leading to information disclosure. The severity of this vulnerability is rated with a CVSS score of 5.3, indicating a moderate risk level.
How To Fix
Minimum fixed version
2.4.43-r0
This is the first release that contains the fix.
sudo apk add --upgrade apache2Tip — 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 the mod_proxy_ftp module until a patch can be applied. This can be done by commenting out or removing the relevant configuration lines in the Apache configuration file that load the mod_proxy_ftp module.
Conclusion
The Apache HTTP Server vulnerability CVE-2020-1934 poses a moderate risk due to uninitialized memory exposure in the mod_proxy_ftp module. It is crucial for users to update to version 2.4.43-r0 or later to mitigate this risk. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2020-1934 is a vulnerability in Apache HTTP Server that allows uninitialized memory exposure when using the mod_proxy_ftp module.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability could lead to unauthorized access to sensitive information stored in memory, posing a risk to data confidentiality.
Yes, a patch is available in Apache HTTP Server version 2.4.43-r0 and later. It is recommended to update to this version or newer.
If you cannot update immediately, consider disabling the mod_proxy_ftp module as a temporary workaround to mitigate the risk.
References
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