Arbitrary File Write Vulnerability in libpgjava: CVE-2022-26520
Summary
DEBIAN-CVE-2022-26520: In pgjdbc before 42.3.3, an attacker (who controls the jdbc URL or properties) can call java.util.logging.FileHandler to write to arbitrary files through the loggerFile and loggerLevel connection properties. Affects libpgjava versions < 42.2.15-1+deb11u1. Fixed in 42.2.15-1+deb11u1. How to fix ↓
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Background
libpgjava is a JDBC driver for PostgreSQL, allowing Java applications to connect to PostgreSQL databases. It provides a means for Java applications to execute SQL commands and manage database transactions. The driver is essential for applications that require database interaction, but it can be vulnerable if misconfigured, particularly when using untrusted connection properties.
Vulnerability Detail
In pgjdbc versions prior to 42.3.3, an attacker who controls the JDBC URL or properties can exploit the loggerFile and loggerLevel connection properties to write to arbitrary files. This could lead to severe security issues, such as creating executable files within a web server's root directory, potentially allowing remote code execution. The vulnerability arises from the improper handling of logging properties, which can be manipulated by untrusted sources.
How To Fix
Minimum fixed version
42.2.15-1+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libpgjavaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using untrusted connection properties when configuring the JDBC URL. Ensure that only trusted sources can provide connection parameters to mitigate the risk of exploitation.
Conclusion
The libpgjava package has a critical vulnerability (CVE-2022-26520) that allows arbitrary file writes through manipulated connection properties. It is essential to update to the patched versions to secure your applications and prevent potential exploits. Additionally, using trusted connection properties can help mitigate risks until updates are applied.
See every vulnerability recorded for libpgjava →
FAQ
CVE-2022-26520 is a vulnerability in the libpgjava JDBC driver that allows attackers to write arbitrary files through manipulated connection properties.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor for open-source vulnerabilities without needing to sign up.
If exploited, this vulnerability could allow an attacker to create executable files on the server, leading to potential remote code execution and compromise of the application.
If immediate updates are not possible, ensure that your application does not accept untrusted connection properties to minimize the risk of exploitation.
Yes, the permanent fix is to update the libpgjava package to the latest patched version as specified in the 'how to fix' section.
References
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