Heap over-read via malformed RegExp pattern
Published Jun 10, 2021 · Updated Aug 4, 2024
Out-of-bounds read in JerryScript 2.2.0 allows attackers to read beyond a heap buffer through a crafted regular expression. lit_read_code_unit_from_utf8 in lit-strings.c reads one byte past an allocated string while compiling a Unicode RegExp containing an unpaired surrogate. Execution of attacker-controlled JavaScript is required; the public reproducer demonstrates an AddressSanitizer abort, while code execution or disclosure of buffer contents is not established.
Summary
What happened
Out-of-bounds read in JerryScript 2.2.0 allows attackers to read beyond a heap buffer through a crafted regular expression. lit_read_code_unit_from_utf8 in lit-strings.c reads one byte past an allocated string while compiling a Unicode RegExp containing an unpaired surrogate. Execution of attacker-controlled JavaScript is required; the public reproducer demonstrates an AddressSanitizer abort, while code execution or disclosure of buffer contents is not established.
The record
- CVE
- CVE-2020-23321
- Published
- Jun 10, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
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
- JerryScript lone-surrogate RegExp reproducerproof of concept · demonstrated
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