Memory corruption via split HTTP header parsing
Published Jul 20, 2023 · Updated Feb 13, 2025
Out-of-bounds write in GNU GRUB before 2.06-3 allows remote attackers to corrupt bootloader memory via split HTTP headers. The split-header path in grub-core/net/http.c advances the newline pointer unlike the unsplit path, causing parse_line() to write a terminating NUL one byte beyond current_line. The gate is attacker-controlled packet boundaries during GRUB HTTP retrieval; adjacent allocator metadata can be corrupted, while code execution is not established.
Summary
What happened
Out-of-bounds write in GNU GRUB before 2.06-3 allows remote attackers to corrupt bootloader memory via split HTTP headers. The split-header path in grub-core/net/http.c advances the newline pointer unlike the unsplit path, causing parse_line() to write a terminating NUL one byte beyond current_line. The gate is attacker-controlled packet boundaries during GRUB HTTP retrieval; adjacent allocator metadata can be corrupted, while code execution is not established.
The record
- CVE
- CVE-2022-28734
- Published
- Jul 20, 2023
- Updated
- Feb 13, 2025
- Vendor
- The GnuPG Project
- Product
- GNU GRUB
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 20, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <2.06-3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo