Expected Behavior Violation Affecting grpc package, versions <1.58.3>=1.59.0, <1.59.5>=1.60.0, <1.60.2>=1.61.0, <1.61.3>=1.62.0, <1.62.3>=1.63.0, <1.63.2>=1.64.0, <1.64.3>=1.65.0, <1.65.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-GRPC-7641067
- published6 Aug 2024
- disclosed6 Aug 2024
- creditUnknown
Introduced: 6 Aug 2024
CVE-2024-7246 (opens in a new tab)How to fix?
Upgrade grpc to version 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4 or higher.
Overview
Affected versions of this package are vulnerable to Expected Behavior Violation via the HPackParser function when the gRPC client is communicating with an HTTP/2 proxy, allowing the attacker to poison the HPACK table. By manipulating the header encoding and poisoning the HPACK table between the proxy and the backend, an attacker can cause other gRPC clients to see failed requests or potentially leak HTTP header keys but not their values.
This vulnerability exists because the error status for a misencoded header is not cleared between header reads, resulting in subsequent (incrementally indexed) added headers in the first request being poisoned until cleared from the HPACK table.