Remote code execution via query-pair off-by-one
Published Aug 4, 2022 · Updated Aug 3, 2024
Heap-based buffer overflow in CrowCpp Crow before 1.0+4 allows remote attackers to execute code through a crafted HTTP query string. In qs_parse in query_string.h, an unconditional index increment after filling the 256-entry qs_kv vector makes the decode loop dereference a pointer one element beyond the heap allocation. Sending at least 257 key-value pairs requires no authentication; failed exploitation crashes the service, while controlled heap layout permits code execution.
Summary
What happened
Heap-based buffer overflow in CrowCpp Crow before 1.0+4 allows remote attackers to execute code through a crafted HTTP query string. In qs_parse in query_string.h, an unconditional index increment after filling the 256-entry qs_kv vector makes the decode loop dereference a pointer one element beyond the heap allocation. Sending at least 257 key-value pairs requires no authentication; failed exploitation crashes the service, while controlled heap layout permits code execution.
The record
- CVE
- CVE-2022-34970
- Published
- Aug 4, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-193, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 4, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 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.
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.
Public exploit references
- Proof-of-concept query-string crash scriptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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