CVE-2023-29409

Large RSA keys can cause high CPU usage in crypto/tls

Published Aug 2, 2023 CVSS 3.1 · 5.3 Medium EPSS 1.6% KEV · Not listed
Description
Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-32978 Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.
History
Type Values Removed Values Added
First Time appeared Redhat stf
CPEs cpe:/a:redhat:service_telemetry_framework:1.5::el8 cpe:/a:redhat:stf:1.5::el8
Vendors & Products Redhat service Telemetry Framework
Redhat stf
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat openshift Distributed Tracing
CPEs cpe:/a:redhat:openshift_distributed_tracing:2.9::el8
Vendors & Products Redhat openshift Distributed Tracing
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift_distributed_tracing:2.9::el8
Vendors & Products Redhat openshift Distributed Tracing