Local assembler crash via null token dereference
Published Apr 12, 2023 · Updated Aug 2, 2024
Denial of service in Yasm 1.3.0.55.g101bc allows local users to crash an assembler process with a crafted source file. During NASM macro expansion, expand_macros_in_string passes a null token pointer to delete_Token, which dereferences t->next and triggers a segmentation violation. Exploitation requires processing attacker-controlled assembly input; the vendor considers that input trusted and expects libyasm callers to validate it or use a sandbox.
Summary
What happened
Denial of service in Yasm 1.3.0.55.g101bc allows local users to crash an assembler process with a crafted source file. During NASM macro expansion, expand_macros_in_string passes a null token pointer to delete_Token, which dereferences t->next and triggers a segmentation violation. Exploitation requires processing attacker-controlled assembly input; the vendor considers that input trusted and expects libyasm callers to validate it or use a sandbox.
The record
- CVE
- CVE-2023-29581
- Published
- Apr 12, 2023
- Updated
- Aug 2, 2024
- Vendor
- Tortall Networks
- Product
- Yasm
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 12, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 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=1.3.0.55.g101bc
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
- delete_Token crash proof of conceptproof 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