The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades CVE-2024-27892 has been fixed in the following releases: * 4.31.3M and later releases in the 4.31.x train * 4.30.6M and later release in the 4.30.x train * 4.29.8M and later releases in the 4.29.x train * 4.28.11M and later releases in the 4.28.x train

The following hotfix can be applied to remediate CVE-2024-27892. The hotfix only applies to the releases listed below and no other releases. Note: Installing/uninstalling the SWIX will cause the OpenConfig/Octa process to restart. Services may be unavailable for up to one minute. EOS Versions 4.30.5 32 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.30.5_32_Hotfix.swix SWIX hash:(SHA512) 85ec967b17231edd542800a4a5b305de93308ba5365c858470e7ce848bbc6c357be614f2f668b4a1d93c7afa2cb5e62ac12efda00874f6801dff35351da9ed93   64 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.30.5_64_Hotfix.swix SWIX hash:(SHA512) 263331d15057c38e2e9c4af20f9795989ec962dc159c3136f4eb2e2370859866534b44a17ba9c2ec3249071ccfe83eb0047960693864de532de44fe36766fd70   EOS Versions 4.29.7 32 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.29.7_32_Hotfix.swix SWIX hash:(SHA512) 0317d77d621fa648aa15d607c6db1a8f648da82e14e0886aea0525e0d726ff83a0ed507755b733d1644797dece85203dfe6998b65108b10ba5a9b9be8f57c4f0   64 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.29.7_64_Hotfix.swix SWIX hash:(SHA512) d6d1d806fbd80d9d3972d8bb965b82cf1241c166ce960ff2af12de084c17160433188683fe48d5e3f24ba996e4b4262e95998683c50f80ce2f870fd3f02cbdc4   EOS Versions 4.28.10.1 32 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.28.10.1_32_Hotfix.swix SWIX hash:(SHA512) 12ec36dd68decff5d81f68504dfdba0c01697153366c6de01ac5189c0250516a01d0128179155b21bd028cbbc1b634e8bc143244a2bed089824d4dc4b6c92449   64 bit Version: 1.0 URL: https://www.arista.com/support/advisories-notices/sa-download/?sa99-CVE-2024-27890_CVE-2024-27892_4.28.10.1_64_Hotfix.swix SWIX hash:(SHA512) 2f01a806867d6ffc95bef907164b3c92058382ccda5af006f66f350575a235a6f1ed491974b68dc952947d7cf9897028efa2266411e380da6a646719a420ec52   For instructions on installation and verification of the hotfix patch, refer to the  “managing eos extensions” https://www.arista.com/en/um-eos/eos-managing-eos-extensions  section in the EOS User Manual. Ensure that the patch is made persistent across reboots by running the command ‘copy installed-extensions boot-extensions’.

In order to be vulnerable to CVE-2024-27892, the only condition is that OpenConfig must be enabled with an SSL profile: switch(config-gnmi-transport-default)#show management api gnmi Transport: default Enabled: yes Server: running on port 6030, in default VRF SSL profile: profile-name QoS DSCP: none Authorization required: no Accounting requests: no Notification timestamp: last change time Listen addresses: :: Authentication username priority: x509-spiffe, metadata, x509-common-name If OpenConfig is not configured there is no exposure to this issue and the message will look like: switch(config)#show management api gnmi Enabled: no transports enabled

The workaround is to disable gNMI Set requests. This can be done by applying per RPC authorization and ensuring no user is authorized to run the OpenConfig.Set command. switch(config-gnmi-transport-default)#show management api gnmi transport grpc default authorization requests Alternatively, TLS can be disabled: switch(config-gnmi-transport-default)#no ssl profile Alternatively, the OpenConfig agent can be disabled entirely: switch(config-gnmi-transport-default)#no management api gnmi