Guest-to-host root code execution via unchecked memrw addresses
Published Mar 14, 2020 · Updated Aug 4, 2024
Memory access validation failure in grub2-bhyve before 0.40_8 allows guest OS users to execute code as root on the FreeBSD host. The grub_cmd_read and grub_cmd_write handlers cast a guest-controlled address from grub2.cfg directly to a pointer, permitting arbitrary access to the bootloader's virtual address space. A guest that controls its disk image can overwrite a preboot callback and run shellcode because the host process runs as root without a sandbox.
Summary
What happened
Memory access validation failure in grub2-bhyve before 0.40_8 allows guest OS users to execute code as root on the FreeBSD host. The grub_cmd_read and grub_cmd_write handlers cast a guest-controlled address from grub2.cfg directly to a pointer, permitting arbitrary access to the bootloader's virtual address space. A guest that controls its disk image can overwrite a preboot callback and run shellcode because the host process runs as root without a sandbox.
The record
- CVE
- CVE-2020-10565
- Published
- Mar 14, 2020
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-119, T1611
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 14, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- grub-bhyve memrw guest-to-host escape demonstrationfunctional · demonstrated
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Technologies
Your stack
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Your stack
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