CVE-2020-1662
Vulnerability from cvelistv5
Published
2020-10-16 20:31
Modified
2024-09-16 19:04
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping.
References
sirt@juniper.nethttps://kb.juniper.net/JSA11059Vendor Advisory
Impacted products
Juniper NetworksJunos OS
Juniper NetworksJunos OS Evolved
Show details on NVD website

To clipboard 

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          "value": "On Juniper Networks Junos OS and Junos OS Evolved devices, BGP session flapping can lead to a routing process daemon (RPD) crash and restart, limiting the attack surface to configured BGP peers. This issue only affects devices with BGP damping in combination with accepted-prefix-limit configuration. When the issue occurs the following messages will appear in the /var/log/messages: rpd[6046]: %DAEMON-4-BGP_PREFIX_THRESH_EXCEEDED: XXXX (External AS x): Configured maximum accepted prefix-limit threshold(1800) exceeded for inet6-unicast nlri: 1984 (instance master) rpd[6046]: %DAEMON-3-BGP_CEASE_PREFIX_LIMIT_EXCEEDED: 2001:x:x:x::2 (External AS x): Shutting down peer due to exceeding configured maximum accepted prefix-limit(2000) for inet6-unicast nlri: 2001 (instance master) rpd[6046]: %DAEMON-4: bgp_rt_maxprefixes_check_common:9284: NOTIFICATION sent to 2001:x:x:x::2 (External AS x): code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached) AFI: 2 SAFI: 1 prefix limit 2000 kernel: %KERN-5: mastership_relinquish_on_process_exit: RPD crashed on master RE. Sending SIGUSR2 to chassisd (5612:chassisd) to trigger RE switchover This issue affects: Juniper Networks Junos OS: 17.2R3-S3; 17.3 version 17.3R3-S3 and later versions, prior to 17.3R3-S8; 17.4 version 17.4R2-S4, 17.4R3 and later versions, prior to 17.4R2-S10, 17.4R3-S2; 18.1 version 18.1R3-S6 and later versions, prior to 18.1R3-S10; 18.2 version 18.2R3 and later versions, prior to 18.2R3-S4; 18.2X75 version 18.2X75-D50, 18.2X75-D60 and later versions, prior to 18.2X75-D53, 18.2X75-D65; 18.3 version 18.3R2 and later versions, prior to 18.3R2-S4, 18.3R3-S2; 18.4 version 18.4R2 and later versions, prior to 18.4R2-S5, 18.4R3-S2; 19.1 version 19.1R1 and later versions, prior to 19.1R2-S2, 19.1R3-S1; 19.2 version 19.2R1 and later versions, prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S2, 20.1R2. Juniper Networks Junos OS Evolved prior to 20.1R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R3-S3."
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      "title": "Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping.",
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          "value": "There are multiple workarounds that can be applied to prevent this issue:\n\n1.  Disable BGP router flap damping.\n\n2.  Replace \"accepted-prefix-limit\" with \"prefix-limit\" in the BGP configuration, for example: \n  [edit protocols bgp group ${GRP} neighbor ${NEI} family ${AFI} unicast] \n  +          prefix-limit {\n  -         accepted-prefix-limit {\n\n 3.  Make sure that the BGP session idle-timeout is longer than damping max-suppress time. \nIn other words, by the time a peer is eligible to establish BGP session again, no previously advertised prefixes remain suppressed.\nThe BGP session idle time out is configured under:\n  [protocols bgp damping ... teardown \u003cTEARDOWN_VALUE\u003e idle-timeout \u003cIDLE_TIMEOUT_VALUE\u003e]\nThe BGP damping max-suppress time configured under:\n  [protocol bgp damping... max-suppress  \u003cMAX_SUPPRES_VALUE\u003e]\nThe \u003cIDLE_TIMEOUT_VALUE\u003e needs to be higher than \u003cMAX_SUPPRES_VALUE\u003e"
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              "value": "On Juniper Networks Junos OS and Junos OS Evolved devices, BGP session flapping can lead to a routing process daemon (RPD) crash and restart, limiting the attack surface to configured BGP peers. This issue only affects devices with BGP damping in combination with accepted-prefix-limit configuration. When the issue occurs the following messages will appear in the /var/log/messages: rpd[6046]: %DAEMON-4-BGP_PREFIX_THRESH_EXCEEDED: XXXX (External AS x): Configured maximum accepted prefix-limit threshold(1800) exceeded for inet6-unicast nlri: 1984 (instance master) rpd[6046]: %DAEMON-3-BGP_CEASE_PREFIX_LIMIT_EXCEEDED: 2001:x:x:x::2 (External AS x): Shutting down peer due to exceeding configured maximum accepted prefix-limit(2000) for inet6-unicast nlri: 2001 (instance master) rpd[6046]: %DAEMON-4: bgp_rt_maxprefixes_check_common:9284: NOTIFICATION sent to 2001:x:x:x::2 (External AS x): code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached) AFI: 2 SAFI: 1 prefix limit 2000 kernel: %KERN-5: mastership_relinquish_on_process_exit: RPD crashed on master RE. Sending SIGUSR2 to chassisd (5612:chassisd) to trigger RE switchover This issue affects: Juniper Networks Junos OS: 17.2R3-S3; 17.3 version 17.3R3-S3 and later versions, prior to 17.3R3-S8; 17.4 version 17.4R2-S4, 17.4R3 and later versions, prior to 17.4R2-S10, 17.4R3-S2; 18.1 version 18.1R3-S6 and later versions, prior to 18.1R3-S10; 18.2 version 18.2R3 and later versions, prior to 18.2R3-S4; 18.2X75 version 18.2X75-D50, 18.2X75-D60 and later versions, prior to 18.2X75-D53, 18.2X75-D65; 18.3 version 18.3R2 and later versions, prior to 18.3R2-S4, 18.3R3-S2; 18.4 version 18.4R2 and later versions, prior to 18.4R2-S5, 18.4R3-S2; 19.1 version 19.1R1 and later versions, prior to 19.1R2-S2, 19.1R3-S1; 19.2 version 19.2R1 and later versions, prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S2, 20.1R2. Juniper Networks Junos OS Evolved prior to 20.1R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R3-S3."
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            "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS:  17.2R3-S4, 17.3R3-S8, 17.3R3-S9, 17.4R2-S10, 17.4R3-S2, 18.1R3-S10, 18.2R3-S4, 18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3-S2, 18.4R2-S5, 18.4R3-S2, 19.1R2-S2, 19.1R3-S1, 19.2R1-S5, 19.2R2, 19.3R2-S3, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1-S2, 20.1R2, 20.2R1, and all subsequent releases.\n\n\nJunos OS Evolved: 20.1R2-EVO, and all subsequent releases."
          }
        ],
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          "defect": [
            "1490079"
          ],
          "discovery": "USER"
        },
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            "lang": "en",
            "value": "There are multiple workarounds that can be applied to prevent this issue:\n\n1.  Disable BGP router flap damping.\n\n2.  Replace \"accepted-prefix-limit\" with \"prefix-limit\" in the BGP configuration, for example: \n  [edit protocols bgp group ${GRP} neighbor ${NEI} family ${AFI} unicast] \n  +          prefix-limit {\n  -         accepted-prefix-limit {\n\n 3.  Make sure that the BGP session idle-timeout is longer than damping max-suppress time. \nIn other words, by the time a peer is eligible to establish BGP session again, no previously advertised prefixes remain suppressed.\nThe BGP session idle time out is configured under:\n  [protocols bgp damping ... teardown \u003cTEARDOWN_VALUE\u003e idle-timeout \u003cIDLE_TIMEOUT_VALUE\u003e]\nThe BGP damping max-suppress time configured under:\n  [protocol bgp damping... max-suppress  \u003cMAX_SUPPRES_VALUE\u003e]\nThe \u003cIDLE_TIMEOUT_VALUE\u003e needs to be higher than \u003cMAX_SUPPRES_VALUE\u003e"
          }
        ]
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    }
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  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2020-1662",
    "datePublished": "2020-10-16T20:31:26.882621Z",
    "dateReserved": "2019-11-04T00:00:00",
    "dateUpdated": "2024-09-16T19:04:48.478Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-1662\",\"sourceIdentifier\":\"sirt@juniper.net\",\"published\":\"2020-10-16T21:15:12.443\",\"lastModified\":\"2020-10-28T17:52:45.217\",\"vulnStatus\":\"Analyzed\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"On Juniper Networks Junos OS and Junos OS Evolved devices, BGP session flapping can lead to a routing process daemon (RPD) crash and restart, limiting the attack surface to configured BGP peers. This issue only affects devices with BGP damping in combination with accepted-prefix-limit configuration. When the issue occurs the following messages will appear in the /var/log/messages: rpd[6046]: %DAEMON-4-BGP_PREFIX_THRESH_EXCEEDED: XXXX (External AS x): Configured maximum accepted prefix-limit threshold(1800) exceeded for inet6-unicast nlri: 1984 (instance master) rpd[6046]: %DAEMON-3-BGP_CEASE_PREFIX_LIMIT_EXCEEDED: 2001:x:x:x::2 (External AS x): Shutting down peer due to exceeding configured maximum accepted prefix-limit(2000) for inet6-unicast nlri: 2001 (instance master) rpd[6046]: %DAEMON-4: bgp_rt_maxprefixes_check_common:9284: NOTIFICATION sent to 2001:x:x:x::2 (External AS x): code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached) AFI: 2 SAFI: 1 prefix limit 2000 kernel: %KERN-5: mastership_relinquish_on_process_exit: RPD crashed on master RE. Sending SIGUSR2 to chassisd (5612:chassisd) to trigger RE switchover This issue affects: Juniper Networks Junos OS: 17.2R3-S3; 17.3 version 17.3R3-S3 and later versions, prior to 17.3R3-S8; 17.4 version 17.4R2-S4, 17.4R3 and later versions, prior to 17.4R2-S10, 17.4R3-S2; 18.1 version 18.1R3-S6 and later versions, prior to 18.1R3-S10; 18.2 version 18.2R3 and later versions, prior to 18.2R3-S4; 18.2X75 version 18.2X75-D50, 18.2X75-D60 and later versions, prior to 18.2X75-D53, 18.2X75-D65; 18.3 version 18.3R2 and later versions, prior to 18.3R2-S4, 18.3R3-S2; 18.4 version 18.4R2 and later versions, prior to 18.4R2-S5, 18.4R3-S2; 19.1 version 19.1R1 and later versions, prior to 19.1R2-S2, 19.1R3-S1; 19.2 version 19.2R1 and later versions, prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S2, 20.1R2. Juniper Networks Junos OS Evolved prior to 20.1R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R3-S3.\"},{\"lang\":\"es\",\"value\":\"En los dispositivos Juniper Networks Junos OS y Junos OS Evolved, la interrupci\u00f3n de la sesi\u00f3n BGP puede conllevar a un bloqueo y reinicio del routing process daemon (RPD), limitando la superficie de ataque a los peers BGP configurados.\u0026#xa0;Este problema solo afecta a los dispositivos con amortiguaci\u00f3n BGP en combinaci\u00f3n con la configuraci\u00f3n accepted-prefix-limit.\u0026#xa0;Cuando el problema ocurre, aparecer\u00e1n los siguientes mensajes en /var/log/messages: rpd[6046]: %DAEMON-4-BGP_PREFIX_THRESH_EXCEEDED: XXXX (External AS x): Configured maximum accepted prefix-limit threshold(1800) exceeded for inet6-unicast nlri: 1984 (instance master) rpd[6046]: %DAEMON-3-BGP_CEASE_PREFIX_LIMIT_EXCEEDED: 2001:x:x:x::2 (External AS x): Shutting down peer due to exceeding configured maximum accepted prefix-limit(2000) for inet6-unicast nlri: 2001 (instance master) rpd[6046]: %DAEMON-4: bgp_rt_maxprefixes_check_common:9284: NOTIFICATION sent to 2001:x:x:x::2 (External AS x): code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached) AFI: 2 SAFI: 1 prefix limit 2000 kernel: %KERN-5: mastership_relinquish_on_process_exit: RPD crashed on master RE. Sending SIGUSR2 to chassisd (5612:chassisd) to trigger RE switchover. Este problema afecta a: Juniper Networks Junos OS: versi\u00f3n 17.2R3-S3; versiones 17.3 17.3R3-S3 y versiones posteriores, anteriores a 17.3R3-S8;\u0026#xa0;17.4 versi\u00f3n 17.4R2-S4, 17.4R3 y versiones posteriores, anteriores a 17.4R2-S10, 17.4R3-S2;\u0026#xa0;18.1 versi\u00f3n 18.1R3-S6 y versiones posteriores, anteriores a 18.1R3-S10;\u0026#xa0;18.2 versi\u00f3n 18.2R3 y versiones posteriores, anteriores a 18.2R3-S4;\u0026#xa0;18.2X75 versi\u00f3n 18.2X75-D50, 18.2X75-D60 y versiones posteriores, anteriores a 18.2X75-D53, 18.2X75-D65;\u0026#xa0;18.3 versi\u00f3n 18.3R2 y versiones posteriores, anteriores a 18.3R2-S4, 18.3R3-S2;\u0026#xa0;18.4 versi\u00f3n 18.4R2 y versiones posteriores, anteriores a 18.4R2-S5, 18.\u0026#xa0;4R3-S2;\u0026#xa0;19.1 versi\u00f3n 19.1R1 y versiones posteriores, anteriores a 19.1R2-S2, 19.1R3-S1;\u0026#xa0;19.2 versi\u00f3n 19.2R1 y versiones posteriores, anteriores a 19.2R1-S5, 19.2R2;\u0026#xa0;19.3 versiones anteriores a 19.3R2-S3, 19.3R3;\u0026#xa0;19.4 versiones anteriores a 19.4R1-S3, 19.4R2;\u0026#xa0;Versiones 20.1 anteriores a 20.1R1-S2, 20.1R2.\u0026#xa0;Juniper Networks Junos OS Evolved versiones anteriores a 20.1R2-EVO.\u0026#xa0;Este problema no afecta a Juniper Networks Junos OS versiones anteriores a 17.2R3-S3\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:N/I:N/A:P\",\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\",\"baseScore\":4.3},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]},{\"source\":\"sirt@juniper.net\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.2:r3-s3:*:*:*:*:*:*\",\"matchCriteriaId\":\"7939BCE6-D4E8-4366-B954-32D77F21A35D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*\",\"matchCriteriaId\":\"488BB10A-1360-42E5-A68D-23D51B332850\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*\",\"matchCriteriaId\":\"64988F0A-E02C-455B-99C9-4059C896416F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.3:r3-s7:*:*:*:*:*:*\",\"matchCriteriaId\":\"C9C703CA-9309-413A-9CD7-585277ADD32D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s4:*:*:*:*:*:*\",\"matchCriteriaId\":\"2B482BCC-1F0C-47AA-B63B-1B39CEF7B2C0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s5:*:*:*:*:*:*\",\"matchCriteriaId\":\"A636F9F2-2DA7-4A27-AD80-FD1B34DFCA94\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s6:*:*:*:*:*:*\",\"matchCriteriaId\":\"4EC7D216-D8F3-4ABD-97C9-4C9FB6DF64FF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*\",\"matchCriteriaId\":\"5E327643-D8D8-4EFA-9F38-BA862A919501\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*\",\"matchCriteriaId\":\"1BC6CE1C-9DD8-429E-BDC2-251D8C8674E3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r2-s9:*:*:*:*:*:*\",\"matchCriteriaId\":\"63B00B4F-3E65-4CB2-807D-43908B570AE6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*\",\"matchCriteriaId\":\"8732E25A-9073-4C7B-9E89-C02368728EB4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*\",\"matchCriteriaId\":\"09255363-BF79-4FC3-AADD-5FAD0902174F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.1:r3-s6:*:*:*:*:*:*\",\"matchCriteriaId\":\"7988CE92-71D2-4EEC-B596-4A60E2C1136A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.1:r3-s7:*:*:*:*:*:*\",\"matchCriteriaId\":\"330D176F-8DAD-440C-A623-44FA233FAB01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.1:r3-s8:*:*:*:*:*:*\",\"matchCriteriaId\":\"8CC5EAB8-1364-4325-9F01-BE7CC479C29D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.1:r3-s9:*:*:*:*:*:*\",\"matchCriteriaId\":\"4E2E933A-852F-4257-860D-09638EE0D2F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2:r3:*:*:*:*:*:*\",\"matchCriteriaId\":\"B670F988-78F2-4BC6-B7FC-E34C280F67DC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2:r3-s1:*:*:*:*:*:*\",\"matchCriteriaId\":\"2F9451C7-6466-4AC9-9A7F-90A2817AED6C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2:r3-s2:*:*:*:*:*:*\",\"matchCriteriaId\":\"871CA952-C5EC-4A25-8EF0-C2EC484F7DE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2:r3-s3:*:*:*:*:*:*\",\"matchCriteriaId\":\"80E2AD65-3DAC-4618-AB73-C43EDCDC7A13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2x75:d50:*:*:*:*:*:*\",\"matchCriteriaId\":\"EAB1E336-C92A-4A65-A3D9-F2926E76A598\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2x75:d51:*:*:*:*:*:*\",\"matchCriteriaId\":\"0F15B017-F0AB-4DB7-9718-85C97CBC19DF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.2x75:d60:*:*:*:*:*:*\",\"matchCriteriaId\":\"0A109959-DE76-44D3-9AE2-0106875B03A0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"B7A3FBD3-5399-42A9-9BD9-E3C981CBD6DB\"},{\"vulnerable\":true,\"criteria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:*:*:*:*:*:*\",\"matchCriteriaId\":\"41CD982F-E6F2-4951-9F96-A76C142DF08E\"}]}]}],\"references\":[{\"url\":\"https://kb.juniper.net/JSA11059\",\"source\":\"sirt@juniper.net\",\"tags\":[\"Vendor Advisory\"]}]}}"
  }
}


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