Remote code execution via IOBuf size overflow
Published Jul 23, 2021 · Updated Aug 3, 2024
Heap overflow in affected Folly and HHVM releases allows remote attackers to execute code by supplying an attacker-controlled IOBuf size. IOBuf allocation and reserve paths add capacity, headroom, and tailroom values without checked arithmetic, allowing the calculated heap allocation size to wrap before data is written. Reachability requires HHVM or another Folly consumer to pass remotely controlled size data into these paths, and successful corruption grants code execution in that process.
Summary
What happened
Heap overflow in affected Folly and HHVM releases allows remote attackers to execute code by supplying an attacker-controlled IOBuf size. IOBuf allocation and reserve paths add capacity, headroom, and tailroom values without checked arithmetic, allowing the calculated heap allocation size to wrap before data is written. Reachability requires HHVM or another Folly consumer to pass remotely controlled size data into these paths, and successful corruption grants code execution in that process.
The record
- CVE
- CVE-2021-24036
- Published
- Jul 23, 2021
- Updated
- Aug 3, 2024
- Vendor
- Meta Platforms, Inc.
- Product
- HHVM
- Classifications
- CWE-122, CWE-190, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 23, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record 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=4.102.0 <unspecified
- Affected versionversion=4.113.0
- Affected versionversion=4.114.0
- Affected versionversion=4.115.0
- Affected versionversion=4.116.0
- Affected versionversion=4.117.0
- Affected versionversion=4.118.0 <unspecified
- Affected versionversion=4.81.0 <unspecified
- Affected versionversion=unspecified <4.80.5
What conditions does exploitation require?
What is affected?
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
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