CVE-2017-17458 : Security Advisory and Response
Learn about CVE-2017-17458 affecting Mercurial versions before 4.4.1. Discover the impact, technical details, and mitigation steps for this security vulnerability.
CVE-2017-17458 was published on December 7, 2017, and affects Mercurial versions prior to 4.4.1. This vulnerability allows specially manipulated repositories to execute arbitrary code in Git subrepositories through a post-update script.
Understanding CVE-2017-17458
This CVE highlights a security flaw in Mercurial that could lead to the execution of arbitrary code in Git subrepositories.
What is CVE-2017-17458?
In Mercurial versions before 4.4.1, a maliciously crafted repository could trigger the execution of arbitrary code in Git subrepositories via a post-update script included in the repository.
The Impact of CVE-2017-17458
The vulnerability could allow an attacker to execute arbitrary code within the context of the affected repository, potentially leading to unauthorized access or data manipulation.
Technical Details of CVE-2017-17458
This section delves into the technical aspects of the CVE.
Vulnerability Description
The flaw in Mercurial versions prior to 4.4.1 enables the execution of arbitrary code in Git subrepositories through a specially crafted repository.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions affected: All versions prior to 4.4.1
Exploitation Mechanism
The vulnerability allows the execution of arbitrary code by manipulating a repository to trigger the post-update script in Git subrepositories.
Mitigation and Prevention
Protecting systems from CVE-2017-17458 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Mercurial to version 4.4.1 or later to mitigate the vulnerability.
- Avoid interacting with repositories from untrusted or unknown sources.
Long-Term Security Practices
- Regularly monitor for security updates and apply patches promptly.
- Implement code review processes to detect and prevent the introduction of malicious code.
Patching and Updates
Ensure that all systems running Mercurial are updated to version 4.4.1 or above to address the vulnerability.