Process crash via incorrect ELF section count
Published Dec 31, 2021 · Updated Aug 4, 2024
Heap-based buffer overflow in libbpf 0.6.0 and 0.6.1 allows context-dependent attackers to crash a process via a crafted ELF object. In __bpf_object__open, direct use of the ELF header's e_shnum value can allocate a zero-entry section array even when libelf resolves a nonzero extended section count, and later section collection writes eight bytes beyond it. A consuming application must pass attacker-controlled ELF data to bpf_object__open_mem; published evidence reports availability impact, not code execution.
Summary
What happened
Heap-based buffer overflow in libbpf 0.6.0 and 0.6.1 allows context-dependent attackers to crash a process via a crafted ELF object. In __bpf_object__open, direct use of the ELF header's e_shnum value can allocate a zero-entry section array even when libelf resolves a nonzero extended section count, and later section collection writes eight bytes beyond it. A consuming application must pass attacker-controlled ELF data to bpf_object__open_mem; published evidence reports availability impact, not code execution.
The record
- CVE
- CVE-2021-45941
- Published
- Dec 31, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 31, 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?
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.
Public exploit references
- OSS-Fuzz bpf-object-fuzzer crash reproducer 40957proof of concept · demonstrated
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Technologies
Your stack
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Your stack
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