Client crash via freed proxy-tunnel state
Published Feb 9, 2023 · Updated Oct 27, 2024
Use-after-free in curl 7.16.0 through 7.86.0 allows remote attackers controlling an HTTP proxy to crash the client during tunnel denial. When an SMB or TELNET tunnel is denied, its done handler frees protocol-specific request state that transfer shutdown later reuses. Reachability requires a tunneled SMB or TELNET transfer through a hostile HTTP proxy; the bounded consequence is client process termination.
Summary
What happened
Use-after-free in curl 7.16.0 through 7.86.0 allows remote attackers controlling an HTTP proxy to crash the client during tunnel denial. When an SMB or TELNET tunnel is denied, its done handler frees protocol-specific request state that transfer shutdown later reuses. Reachability requires a tunneled SMB or TELNET transfer through a hostile HTTP proxy; the bounded consequence is client process termination.
The record
- CVE
- CVE-2022-43552
- Published
- Feb 9, 2023
- Updated
- Oct 27, 2024
- Vendor
- curl
- Product
- curl
- Classifications
- CWE-416, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 9, 2023CVE publishedPublication date reported by the CVE source.
- Oct 27, 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?
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- Affected versionversion=Fixed in curl 7.87.0
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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