In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when data is sent to the standard input. This can result in a memory leak on the microVM emulation thread, possibly occupying more memory than intended on the host.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27174
Reference (s):
- https://github.com/firecracker-microvm/firecracker/issues/2177
- https://github.com/firecracker-microvm/firecracker/pull/2178
- https://github.com/firecracker-microvm/firecracker/pull/2179
- MLIST:[oss-security] 20201023 CVE-2020-27174: Firecracker serial console emulation may allocate an unbounded amount of memory
- URL: http://www.openwall.com/lists/oss-security/2020/10/23/1