CVE-2023-32731

Description

When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration.

How to fix CVE-2023-32731

To remediate CVE-2023-32731, upgrade the affected package to a fixed version below.

• —upgrade to 1.53.1 or later
• —upgrade to 1.53.1 or later
• —upgrade to 1.53.1 or later

Is CVE-2023-32731 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• >= 1.53.0, < 1.53.1
• >= 1.53.0, < 1.53.1
• >= 1.53.0, < 1.53.1

CVSS scores

References (9)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-32731
• WEBgithub.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10
• WEBgithub.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946
• WEBgithub.com/grpc/grpc/issues/33463