Client process crash via unbounded Brotli decompression
Published Jul 19, 2023 · Updated Oct 28, 2024
Uncontrolled resource consumption in Block, Inc. OkHttp Brotli allows remote attackers to crash a client via a malicious HTTP response. The BrotliInterceptor.intercept() path automatically decompresses a Brotli-encoded body without limiting its expansion, allowing kilobytes to consume gigabytes of memory. The interceptor must be enabled, and reachability requires a malicious server or a man-in-the-middle attacker able to inject the response.
Summary
What happened
Uncontrolled resource consumption in Block, Inc. OkHttp Brotli allows remote attackers to crash a client via a malicious HTTP response. The BrotliInterceptor.intercept() path automatically decompresses a Brotli-encoded body without limiting its expansion, allowing kilobytes to consume gigabytes of memory. The interceptor must be enabled, and reachability requires a malicious server or a man-in-the-middle attacker able to inject the response.
The record
- CVE
- CVE-2023-3782
- Published
- Jul 19, 2023
- Updated
- Oct 28, 2024
- Vendor
- Block, Inc.
- Product
- OkHttp Brotli
- Classifications
- CWE-400, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 19, 2023CVE publishedPublication date reported by the CVE source.
- Oct 28, 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?
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.
Weakness, pattern, technique
Public exploit references
- JFrog OkHttp Brotli decompression-bomb proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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