Description
A UNIX symbolic link following issue in the jailer component in Firecracker version v1.13.1 and earlier and 1.14.0 on Linux may allow a local host user with write access to the pre-created jailer directories to overwrite arbitrary host files via a symlink attack during the initialization copy at jailer startup, if the jailer is executed with root privileges. To mitigate this issue, users should upgrade to version v1.13.2 or 1.14.1 or above.
CVSS breakdown
CVSS 4.0
Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
High
Availability (Subsequent System)
High
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected products
- AWS / Firecracker1.13.2 – 1.13.2
- AWS / Firecracker1.14.1 – 1.14.1
References
- MISChttps://aws.amazon.com/security/security-bulletins/2026-003-AWS/
- PATCHhttps://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.1
- PATCHhttps://github.com/firecracker-microvm/firecracker/releases/tag/v1.13.2
- VENDOR_ADVISORYhttps://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-36j2-f825-qvgc