CVE-2019-10773 : Security Advisory and Response
Learn about CVE-2019-10773, a vulnerability in Yarn before version 1.21.1 that allows the creation of symbolic links on the host file system, potentially leading to file overwriting. Find mitigation steps and prevention measures here.
Yarn before version 1.21.1 is susceptible to a vulnerability in the package installation feature that can lead to the creation of symbolic links on the host file system, potentially resulting in file overwriting.
Understanding CVE-2019-10773
Prior to version 1.21.1 of Yarn, a security flaw exists that allows the exploitation of the package installation functionality to create deliberate symbolic links on the host file system.
What is CVE-2019-10773?
This CVE refers to a vulnerability in Yarn that enables the generation of arbitrary symlinks on the host filesystem by utilizing specially crafted "bin" keys, potentially leading to the overwriting of existing files based on user permissions.
The Impact of CVE-2019-10773
The vulnerability in Yarn before version 1.21.1 can be exploited to create symbolic links on the host file system, which may result in the overwriting of files, depending on the permissions assigned to the user.
Technical Details of CVE-2019-10773
Yarn's vulnerability allows for the abuse of the package install feature to generate arbitrary symlinks on the host filesystem using crafted "bin" keys.
Vulnerability Description
The flaw in Yarn before version 1.21.1 permits the creation of symbolic links on the host file system, potentially leading to the overwriting of existing files.
Affected Systems and Versions
- Product: Yarn
- Vendor: n/a
- Versions Affected: All versions prior to version 1.21.1
Exploitation Mechanism
The vulnerability can be exploited by manipulating the package installation feature to create symbolic links on the host file system, potentially resulting in file overwriting.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.
Immediate Steps to Take
- Upgrade Yarn to version 1.21.1 or later to mitigate the vulnerability.
- Avoid running Yarn with elevated privileges to minimize the impact of potential file overwriting.
Long-Term Security Practices
- Regularly update Yarn and other software components to ensure the latest security patches are applied.
- Implement least privilege principles to restrict access and reduce the risk of unauthorized file modifications.
Patching and Updates
- Stay informed about security advisories and updates from Yarn's official sources to promptly apply patches and protect against known vulnerabilities.