CVE-2026-73439 (GCVE-0-2026-73439)
Vulnerability from cvelistv5
Published
2026-09-16 08:09
Modified
2026-09-17 03:56
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-842 - Placement of User into Incorrect Group
Summary
On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.
References
Impacted products
Vendor Product Version
Arista Networks EOS Version: 4.33.2F   <
Version: 4.34.0F   <
Version: 4.35.0F   <
Version: 4.36.0F   <
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              "value": "\u003cp\u003eAll of the following conditions must be met for this vulnerability to be exploitable:\u003c/p\u003e\u003col\u003e\u003cli\u003eOpenConfig must be configured with a gNMI transport started. The running configuration will include:\u003cpre\u003e\nmanagement api gnmi\n  transport grpc \u0026lt;name\u0026gt;\n\u003c/pre\u003e\u003c/li\u003e\u003cli\u003egNSI must be configured with the gNSI Pathz service enabled. The running configuration will include:\u003cpre\u003e\nmanagement api gnsi\n  service pathz\n\u003c/pre\u003e\u003c/li\u003e\u003cli\u003eA Pathz policy must be present on the system at \u003ccode\u003e/persist/sys/gnsi/pathz/policy.json\u003c/code\u003e, and that policy must contain at least one group rule and at least one user rule for the same path.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eTo verify the presence of the policy file:\u003c/p\u003e\u003cpre\u003e\nswitch\u0026gt;enable\nswitch#bash stat /persist/sys/gnsi/pathz/policy.json\n\u003c/pre\u003e"
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          "value": "All of the following conditions must be met for this vulnerability to be exploitable:\n\n1. OpenConfig must be configured with a gNMI transport started. The running configuration will include:\n\n  management api gnmi\n    transport grpc \u003cname\u003e\n\n2. gNSI must be configured with the gNSI Pathz service enabled. The running configuration will include:\n\n  management api gnsi\n    service pathz\n\n3. A Pathz policy must be present on the system at /persist/sys/gnsi/pathz/policy.json, and that policy must contain at least one group rule and at least one user rule for the same path.\n\nTo verify the presence of the policy file:\n\n  switch\u003eenable\n  switch#bash stat /persist/sys/gnsi/pathz/policy.json"
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              "value": "\u003cp\u003eOn affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.\u003c/p\u003e"
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              "value": "\u003cp\u003e\u003cstrong\u003eOption 1:\u003c/strong\u003e Disable gNSI Pathz entirely:\u003c/p\u003e\u003cpre\u003e\nswitch#configure\nswitch(config)#management api gnsi\nswitch(config-mgmt-api-gnsi)#no service pathz\n\u003c/pre\u003e\u003cp\u003e\u003cstrong\u003eOption 2:\u003c/strong\u003e Push a new gNSI Pathz policy that does not contain any group rules, using only user-principal rules. To push a new policy via grpcurl:\u003c/p\u003e\u003cpre\u003e\ngrpcurl -protoset ./pathz.proto.pb -H \u0027username:$USER\u0027 -v -d @ -plaintext $TARGET:$PORT gnsi.pathz.v1.Pathz/Rotate \u0026lt;\u0026lt; EOF\n{\n \"upload_request\": {\n   \"version\": \"\u0026lt;version\u0026gt;\",\n   \"created_on\": \u0026lt;timestamp\u0026gt;,\n   \"policy\": \u0026lt;policy\u0026gt;\n }\n}\n{\n \"finalize_rotation\": {}\n}\nEOF\n\u003c/pre\u003e\u003cp\u003eEnsure all rules in the policy use \u003ccode\u003euser\u003c/code\u003e as the principal rather than \u003ccode\u003egroup\u003c/code\u003e to avoid triggering this vulnerability.\u003c/p\u003e"
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          "value": "Option 1: Disable gNSI Pathz entirely:\n\n  switch#configure\n  switch(config)#management api gnsi\n  switch(config-mgmt-api-gnsi)#no service pathz\n\nOption 2: Push a new gNSI Pathz policy that does not contain any group rules, using only user-principal rules. To push a new policy via grpcurl:\n\n  grpcurl -protoset ./pathz.proto.pb -H \u0027username:$USER\u0027 -v -d @ -plaintext $TARGET:$PORT gnsi.pathz.v1.Pathz/Rotate \u003c\u003c EOF\n  {\n   \"upload_request\": {\n     \"version\": \"\u003cversion\u003e\",\n     \"created_on\": \u003ctimestamp\u003e,\n     \"policy\": \u003cpolicy\u003e\n   }\n  }\n  {\n   \"finalize_rotation\": {}\n  }\n  EOF\n\nEnsure all rules in the policy use \"user\" as the principal rather than \"group\" to avoid triggering this vulnerability."
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To push a new policy via grpcurl:\\n\\n  grpcurl -protoset ./pathz.proto.pb -H \u0027username:$USER\u0027 -v -d @ -plaintext $TARGET:$PORT gnsi.pathz.v1.Pathz/Rotate \u003c\u003c EOF\\n  {\\n   \\\"upload_request\\\": {\\n     \\\"version\\\": \\\"\u003cversion\u003e\\\",\\n     \\\"created_on\\\": \u003ctimestamp\u003e,\\n     \\\"policy\\\": \u003cpolicy\u003e\\n   }\\n  }\\n  {\\n   \\\"finalize_rotation\\\": {}\\n  }\\n  EOF\\n\\nEnsure all rules in the policy use \\\"user\\\" as the principal rather than \\\"group\\\" to avoid triggering this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cstrong\u003eOption 1:\u003c/strong\u003e Disable gNSI Pathz entirely:\u003c/p\u003e\u003cpre\u003e\\nswitch#configure\\nswitch(config)#management api gnsi\\nswitch(config-mgmt-api-gnsi)#no service pathz\\n\u003c/pre\u003e\u003cp\u003e\u003cstrong\u003eOption 2:\u003c/strong\u003e Push a new gNSI Pathz policy that does not contain any group rules, using only user-principal rules. To push a new policy via grpcurl:\u003c/p\u003e\u003cpre\u003e\\ngrpcurl -protoset ./pathz.proto.pb -H \u0027username:$USER\u0027 -v -d @ -plaintext $TARGET:$PORT gnsi.pathz.v1.Pathz/Rotate \u0026lt;\u0026lt; EOF\\n{\\n \\\"upload_request\\\": {\\n   \\\"version\\\": \\\"\u0026lt;version\u0026gt;\\\",\\n   \\\"created_on\\\": \u0026lt;timestamp\u0026gt;,\\n   \\\"policy\\\": \u0026lt;policy\u0026gt;\\n }\\n}\\n{\\n \\\"finalize_rotation\\\": {}\\n}\\nEOF\\n\u003c/pre\u003e\u003cp\u003eEnsure all rules in the policy use \u003ccode\u003euser\u003c/code\u003e as the principal rather than \u003ccode\u003egroup\u003c/code\u003e to avoid triggering this vulnerability.\u003c/p\u003e\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eOn affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-842\", \"description\": \"CWE-842 Placement of User into Incorrect Group\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"All of the following conditions must be met for this vulnerability to be exploitable:\\n\\n1. OpenConfig must be configured with a gNMI transport started. The running configuration will include:\\n\\n  management api gnmi\\n    transport grpc \u003cname\u003e\\n\\n2. gNSI must be configured with the gNSI Pathz service enabled. The running configuration will include:\\n\\n  management api gnsi\\n    service pathz\\n\\n3. A Pathz policy must be present on the system at /persist/sys/gnsi/pathz/policy.json, and that policy must contain at least one group rule and at least one user rule for the same path.\\n\\nTo verify the presence of the policy file:\\n\\n  switch\u003eenable\\n  switch#bash stat /persist/sys/gnsi/pathz/policy.json\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAll of the following conditions must be met for this vulnerability to be exploitable:\u003c/p\u003e\u003col\u003e\u003cli\u003eOpenConfig must be configured with a gNMI transport started. The running configuration will include:\u003cpre\u003e\\nmanagement api gnmi\\n  transport grpc \u0026lt;name\u0026gt;\\n\u003c/pre\u003e\u003c/li\u003e\u003cli\u003egNSI must be configured with the gNSI Pathz service enabled. The running configuration will include:\u003cpre\u003e\\nmanagement api gnsi\\n  service pathz\\n\u003c/pre\u003e\u003c/li\u003e\u003cli\u003eA Pathz policy must be present on the system at \u003ccode\u003e/persist/sys/gnsi/pathz/policy.json\u003c/code\u003e, and that policy must contain at least one group rule and at least one user rule for the same path.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eTo verify the presence of the policy file:\u003c/p\u003e\u003cpre\u003e\\nswitch\u0026gt;enable\\nswitch#bash stat /persist/sys/gnsi/pathz/policy.json\\n\u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"shortName\": \"Arista\", \"dateUpdated\": \"2026-09-16T08:09:11.553Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-73439\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-16T14:52:02.194Z\", \"dateReserved\": \"2026-08-12T16:39:35.977Z\", \"assignerOrgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"datePublished\": \"2026-09-16T08:09:11.553Z\", \"assignerShortName\": \"Arista\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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