Arbitrary header injection via unsanitized request values
Published Sep 29, 2023 · Updated Sep 23, 2024
CRLF injection in ithewei libhv before 1.3.3 allows attackers to add arbitrary headers to outbound HTTP requests. The HTTP client serializes request-header values without rejecting embedded carriage-return and line-feed characters, so a crafted value starts another header line. Exploitation requires a consuming application to place attacker-controlled data in a request header; the demonstrated consequence is modification of the request sent downstream.
Summary
What happened
CRLF injection in ithewei libhv before 1.3.3 allows attackers to add arbitrary headers to outbound HTTP requests. The HTTP client serializes request-header values without rejecting embedded carriage-return and line-feed characters, so a crafted value starts another header line. Exploitation requires a consuming application to place attacker-controlled data in a request header; the demonstrated consequence is modification of the request sent downstream.
The record
- CVE
- CVE-2023-26148
- Published
- Sep 29, 2023
- Updated
- Sep 23, 2024
- Vendor
- ithewei
- Product
- libhv
- Classifications
- CWE-74, CWE-93
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 29, 2023CVE publishedPublication date reported by the CVE source.
- Sep 23, 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=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.
Weakness, pattern, technique
Public exploit references
- CRLF Injection in libhv 1.3.0 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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