SB2021062807 - Remote code execution in Flysystem
Published: June 28, 2021
Security Bulletin ID
SB2021062807
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2021-32708)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a race condition. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.
References
- https://github.com/thephpleague/flysystem/commit/f3ad69181b8afed2c9edf7be5a2918144ff4ea32
- https://github.com/thephpleague/flysystem/commit/a3c694de9f7e844b76f9d1b61296ebf6e8d89d74
- https://github.com/thephpleague/flysystem/security/advisories/GHSA-9f46-5r25-5wfm
- https://packagist.org/packages/league/flysystem