Is CVE-2023-32731 in the CISA KEV catalog?

No. CVE-2023-32731 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-32731?

CVE-2023-32731 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2023-32731?

CVE-2023-32731 has an EPSS score of 0.50% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-32731?

Upgrade rhc-worker-playbook on rhel 9 to 0:0.1.10-1.el9_5 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2023-32731

HIGH

7.4

CVSS v3

NVD

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. We recommend upgrading beyond the commit contained in https://github.com/grpc/grpc/pull/33005 https://github.com/grpc/grpc/pull/33005

CWE-440

How to fix

Remediation Available

rhc-worker-playbookRed Hat / RHEL

Fixed in:0:0.1.10-1.el9_5RHSA-2024:10761

rhc-worker-playbookRocky

Fixed in:0:0.1.10-1.el9_5RHSA-2024:10761

rhc-worker-playbook-debuginfoRocky

Fixed in:0:0.1.10-1.el9_5RHSA-2024:10761

rhc-worker-playbook-debuginfoRed Hat / RHEL

Fixed in:0:0.1.10-1.el9_5RHSA-2024:10761

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

0.50%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Patch2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.