{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2023-44186", "ASSIGNER": "sirt@juniper.net", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "\nAn Improper Handling of Exceptional Conditions vulnerability in AS PATH processing of Juniper Networks Junos OS and Junos OS Evolved allows an attacker to send a BGP update message with an AS PATH containing a large number of 4-byte ASes, leading to a Denial of Service (DoS). Continued receipt and processing of these BGP updates will create a sustained Denial of Service (DoS) condition.\n\nThis issue is hit when the router has Non-Stop Routing (NSR) enabled, has a non-4-byte-AS capable BGP neighbor, receives a BGP update message with a prefix that includes a long AS PATH containing large number of 4-byte ASes, and has to advertise the prefix towards the non-4-byte-AS capable BGP neighbor.\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nThis issue affects:\n\nJuniper Networks Junos OS:\n\n\n\n * All versions prior to 20.4R3-S8;\n * 21.1 versions 21.1R1 and later;\n * 21.2 versions prior to 21.2R3-S6;\n * 21.3 versions prior to 21.3R3-S5;\n * 21.4 versions prior to 21.4R3-S5;\n * 22.1 versions prior to 22.1R3-S4;\n * 22.2 versions prior to 22.2R3-S2;\n * 22.3 versions prior to 22.3R2-S2, 22.3R3-S1;\n * 22.4 versions prior to 22.4R2-S1, 22.4R3.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n * All versions prior to 20.4R3-S8-EVO;\n * 21.1 versions 21.1R1-EVO and later;\n * 21.2 versions prior to 21.2R3-S6-EVO;\n * 21.3 versions prior to 21.3R3-S5-EVO;\n * 21.4 versions prior to 21.4R3-S5-EVO;\n * 22.1 versions prior to 22.1R3-S4-EVO;\n * 22.2 versions prior to 22.2R3-S2-EVO;\n * 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;\n * 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO.\n\n\n\n\n\n\n" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-755 Improper Handling of Exceptional Conditions", "cweId": "CWE-755" } ] }, { "description": [ { "lang": "eng", "value": "Denial of Service (DoS)" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Juniper Networks", "product": { "product_data": [ { "product_name": "Junos OS", "version": { "version_data": [ { "version_affected": "<", "version_name": "0", "version_value": "20.4R3-S8" }, { "version_affected": "<", "version_name": "21.1R1", "version_value": "21.1*" }, { "version_affected": "<", "version_name": "21.2", "version_value": "21.2R3-S6" }, { "version_affected": "<", "version_name": "21.3", "version_value": "21.3R3-S5" }, { "version_affected": "<", "version_name": "21.4", "version_value": "21.4R3-S5" }, { "version_affected": "<", "version_name": "22.1", "version_value": "22.1R3-S4" }, { "version_affected": "<", "version_name": "22.2", "version_value": "22.2R3-S2" }, { "version_affected": "<", "version_name": "22.3", "version_value": "22.3R2-S2, 22.3R3-S1" }, { "version_affected": "<", "version_name": "22.4", "version_value": "22.4R2-S1, 22.4R3" } ] } }, { "product_name": "Junos OS Evolved", "version": { "version_data": [ { "version_affected": "<", "version_name": "0", "version_value": "20.4R3-S8-EVO" }, { "version_affected": "<", "version_name": "21.1", "version_value": "21.1*-EVO" }, { "version_affected": "<", "version_name": "21.2", "version_value": "21.2R3-S6-EVO" }, { "version_affected": "<", "version_name": "21.3", "version_value": "21.3R3-S5-EVO" }, { "version_affected": "<", "version_name": "21.4", "version_value": "21.4R3-S5-EVO" }, { "version_affected": "<", "version_name": "22.1", "version_value": "22.1R3-S4-EVO" }, { "version_affected": "<", "version_name": "22.2", "version_value": "22.2R3-S2-EVO" }, { "version_affected": "<", "version_name": "22.3", "version_value": "22.3R2-S2-EVO, 22.3R3-S1-EVO" }, { "version_affected": "<", "version_name": "22.4", "version_value": "22.4R2-S1-EVO, 22.4R3-EVO" } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://supportportal.juniper.net/JSA73150", "refsource": "MISC", "name": "https://supportportal.juniper.net/JSA73150" } ] }, "generator": { "engine": "Vulnogram 0.1.0-av217" }, "source": { "advisory": "JSA73150", "defect": [ "1736029" ], "discovery": "EXTERNAL" }, "configuration": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

Nonstop Active Routing is enabled using the following configuration:

[edit chassis redundancy]
graceful-switchover;

[edit routing-options]
nonstop-routing;" } ], "value": "Nonstop Active Routing is enabled using the following configuration:\n\n [edit chassis redundancy]\ngraceful-switchover;\n\n[edit routing-options]\nnonstop-routing;" } ], "work_around": [ { "lang": "en", "value": "Current operational and security best practices, such as limiting the AS PATH length, should mitigate risk of this issue.\n\nBelow is an example configuration to limit AS PATH to 30 entries:\n\nset groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 from protocol bgp\nset groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 from as-path 31as\nset groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 then reject\nset groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 then accept\nset groups BASE-POLICY policy-options policy-statement Customer-IN term MaxAS-Limit from policy MaxAS-Limit-30\nset groups BASE-BGP protocols bgp group <*-CUSTOMER> import Customer-IN\nset groups BASE-PREFIX-LISTS policy-options as-path 31as \".{31,}\"" } ], "exploit": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

" } ], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\n\n" } ], "solution": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

The following software releases have been updated to resolve this specific issue:

Junos OS: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1, 22.4R2-S1, 22.4R3, 23.2R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S2-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R2-S1-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.

" } ], "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1, 22.4R2-S1, 22.4R3, 23.2R1, and all subsequent releases.\n\nJunos OS Evolved: 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S2-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R2-S1-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.\n\n" } ], "impact": { "cvss": [ { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" } ] } }