Application crash via truncated UTF-8 sequence
Published Apr 21, 2021 · Updated Aug 4, 2024
Out-of-bounds read in cpp-peglib 0.1.12 and earlier allows context-dependent attackers to crash applications via invalid UTF-8 grammar text. The resolve_escape_sequence() path trusts a multibyte lead byte at the end of a grammar buffer, and codepoint_length() returns a two-to-four-byte length without checking that enough bytes remain. A user must cause a cpp-peglib consumer to parse crafted grammar text; the demonstrated result is a one-byte read past the heap allocation followed by process abort.
Summary
What happened
Out-of-bounds read in cpp-peglib 0.1.12 and earlier allows context-dependent attackers to crash applications via invalid UTF-8 grammar text. The resolve_escape_sequence() path trusts a multibyte lead byte at the end of a grammar buffer, and codepoint_length() returns a two-to-four-byte length without checking that enough bytes remain. A user must cause a cpp-peglib consumer to parse crafted grammar text; the demonstrated result is a one-byte read past the heap allocation followed by process abort.
The record
- CVE
- CVE-2020-23915
- Published
- Apr 21, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 21, 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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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.
Public exploit references
- heap-overflow-resolve_escape_sequence proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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