{ "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 * 23.2 versions prior to 23.2R2.\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 * 23.2 versions prior to 23.2R2-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" }, { "version_affected": "<", "version_name": "23.2", "version_value": "23.2R2" } ] } }, { "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" }, { "version_affected": "<", "version_name": "23.2", "version_value": "23.2R2-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", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

Current operational and security best practices, such as limiting the AS PATH length, should mitigate risk of this issue.

Below is an example configuration to limit AS PATH to 30 entries:

set groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 from protocol bgp
set groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 from as-path 31as
set groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 term more-than-30 then reject
set groups BASE-POLICY policy-options policy-statement MaxAS-Limit-30 then accept
set groups BASE-POLICY policy-options policy-statement Customer-IN term MaxAS-Limit from policy MaxAS-Limit-30
set groups BASE-BGP protocols bgp group <*-CUSTOMER> import Customer-IN
set groups BASE-PREFIX-LISTS policy-options as-path 31as \".{31,}\"" } ], "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\n set 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, 23.2R2, 23.3R1, 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, 23.2R2-EVO, 23.3R1-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, 23.2R2, 23.3R1, 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, 23.2R2-EVO, 23.3R1-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" } ] } }