CVE-2017-17459 : Exploit Details and Defense Strategies
Learn about CVE-2017-17459, a critical vulnerability in Fossil versions before 2.4 allowing remote attackers to execute arbitrary commands via SSH URLs. Find mitigation steps and preventive measures here.
In Fossil versions prior to 2.4, a vulnerability exists in the file http_transport.c when using the SSH sync protocol. This flaw enables remote attackers to execute arbitrary commands by manipulating an SSH URL. This vulnerability is akin to other security issues like CVE-2017-9800, CVE-2017-12836, and more.
Understanding CVE-2017-17459
This CVE entry highlights a critical security issue in Fossil versions before 2.4 that allows for remote command execution.
What is CVE-2017-17459?
CVE-2017-17459 is a vulnerability in Fossil's http_transport.c file that permits attackers to run arbitrary commands through a crafted SSH URL.
The Impact of CVE-2017-17459
The vulnerability in Fossil versions prior to 2.4 can be exploited by remote attackers to execute commands with user assistance, posing a significant security risk.
Technical Details of CVE-2017-17459
This section delves into the specific technical aspects of the CVE.
Vulnerability Description
The vulnerability in http_transport.c in Fossil versions before 2.4 allows user-assisted remote attackers to execute arbitrary commands via an SSH URL with a dash character at the hostname's start.
Affected Systems and Versions
- Product: Fossil
- Vendor: N/A
- Versions Affected: All versions before 2.4
Exploitation Mechanism
Attackers can exploit this vulnerability by creating an SSH URL with a hyphen at the beginning of the hostname, enabling the execution of arbitrary commands.
Mitigation and Prevention
Protecting systems from CVE-2017-17459 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Fossil to version 2.4 or newer to mitigate the vulnerability.
- Avoid clicking on suspicious or unverified SSH URLs.
Long-Term Security Practices
- Regularly update software and apply security patches promptly.
- Educate users about the risks of interacting with unknown or suspicious URLs.
Patching and Updates
Ensure that all systems running Fossil are updated to version 2.4 or above to address the vulnerability.