Insecure gid Handling in linux-ftpd Allows Remote Directory Listing
Summary
CVE-2006-7094: ftpd, as used by Gentoo and Debian Linux, sets the gid to the effective uid instead of the effective group id before executing /bin/ls, which allows remote authenticated users to list arbitrary directories with the privi... Affects linux-ftpd versions < 0.17-23. Fixed in 0.17-23. How to fix ↓
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Background
linux-ftpd is a popular FTP server used by Gentoo and Debian Linux distributions. It provides file transfer capabilities over the FTP protocol. The server allows users to authenticate and perform various operations on files and directories. However, a vulnerability in the gid handling of linux-ftpd exposes a security flaw that can be exploited by remote authenticated users.
Vulnerability Detail
The vulnerability, identified as CVE-2006-7094, arises from the incorrect handling of the gid (group ID) by linux-ftpd. When executing the "/bin/ls" command, the server sets the gid to the effective uid (user ID) instead of the effective group id. This flaw enables remote authenticated users to list arbitrary directories with the privileges of gid 0 (root) and potentially enables additional attack vectors. By leveraging this vulnerability, an attacker can gain unauthorized access to sensitive information, escalate privileges, or launch further attacks.
How To Fix
Minimum fixed version
0.17-23
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linux-ftpdTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. However, users can consider implementing additional security measures such as restricting FTP access to trusted users only, monitoring FTP server logs for suspicious activities, and regularly updating the linux-ftpd package to ensure the latest security patches are applied.
Conclusion
Insecure gid handling in linux-ftpd poses a security risk by allowing remote authenticated users to list arbitrary directories with root privileges. To mitigate this vulnerability, it is crucial to update the linux-ftpd package to version 0.17-23 or later. Additionally, implementing recommended security measures and staying informed about the latest vulnerabilities and patches is essential for maintaining a secure FTP server environment. For further assistance or support in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
linux-ftpd is an FTP server software used by Gentoo and Debian Linux distributions to facilitate file transfer operations over the FTP protocol.
The vulnerability allows remote authenticated users to list arbitrary directories with the privileges of gid 0 (root), potentially enabling unauthorized access to sensitive information and additional attack vectors.
To fix this vulnerability, update the linux-ftpd package to version 0.17-23 or later, which includes the necessary fixes. Obtain the updated package from the official package repositories of Gentoo or Debian Linux distributions.
While no specific workaround is mentioned, users can enhance security by restricting FTP access to trusted users, monitoring FTP server logs, and regularly updating the linux-ftpd package.
For more information about this vulnerability, you can refer to the CVE-2006-7094 entry in the National Vulnerability Database (NVD) or the provided database-specific source link.
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