Out-of-bounds write via integer-truncated allocation
Published Mar 10, 2021 · Updated Aug 4, 2024
Heap-based buffer overflow in Meta Platforms HHVM affected releases allows remote attackers to trigger an out-of-bounds write through ldap_escape. The ldap_escape function allocates its output with 3 * value.size() using integer-width arithmetic, so an overly long string wraps the allocation size before the escape loop writes expanded bytes. The published record establishes no consequence beyond the out-of-bounds write; reachability requires an application to pass attacker-controlled, overly long input.
Summary
What happened
Heap-based buffer overflow in Meta Platforms HHVM affected releases allows remote attackers to trigger an out-of-bounds write through ldap_escape. The ldap_escape function allocates its output with 3 * value.size() using integer-width arithmetic, so an overly long string wraps the allocation size before the escape loop writes expanded bytes. The published record establishes no consequence beyond the out-of-bounds write; reachability requires an application to pass attacker-controlled, overly long input.
The record
- CVE
- CVE-2020-1916
- Published
- Mar 10, 2021
- Updated
- Aug 4, 2024
- Vendor
- Meta Platforms, Inc.
- Product
- HHVM
- Classifications
- CWE-787, CWE-122
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 10, 2021CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.57.0 <unspecified
- Affected versionversion=4.79.0
- Affected versionversion=4.80.0
- Affected versionversion=4.81.0
- Affected versionversion=4.82.0
- Affected versionversion=4.83.0
- Affected versionversion=unspecified <4.56.2
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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