Assembler crash via backslash-counter underrun
Published Aug 22, 2023 · Updated Oct 3, 2024
Heap buffer overflow in NASM before 2.15.05 allows attackers to crash the assembler by processing a crafted source file. In quote_for_pmake in asm/nasm.c, a post-decrement loop leaves the backslash counter at -1, and a later loop reuses that negative value to write beyond the allocated heap buffer. Exploitation requires a user to run NASM on attacker-controlled input; the demonstrated consequence is a process crash rather than a system-wide outage.
Summary
What happened
Heap buffer overflow in NASM before 2.15.05 allows attackers to crash the assembler by processing a crafted source file. In quote_for_pmake in asm/nasm.c, a post-decrement loop leaves the backslash counter at -1, and a later loop reuses that negative value to write beyond the allocated heap buffer. Exploitation requires a user to run NASM on attacker-controlled input; the demonstrated consequence is a process crash rather than a system-wide outage.
The record
- CVE
- CVE-2022-29654
- Published
- Aug 22, 2023
- Updated
- Oct 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 22, 2023CVE publishedPublication date reported by the CVE source.
- Oct 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
Public exploit references
- NASM heap-overflow proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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