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Juniper JSA publication 2020-10. See https://advisory.juniper.net for more information.
2020-10-16 22:15:32 +02:00
{
"CVE_data_meta": {
"ASSIGNER": "sirt@juniper.net",
"DATE_PUBLIC": "2020-10-14T16:00:00.000Z",
"ID": "CVE-2020-1662",
"STATE": "PUBLIC",
"TITLE": "Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping."
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Junos OS",
"version": {
"version_data": [
{
"version_affected": "=",
"version_name": "17.2",
"version_value": "17.2R3-S3"
},
{
"version_affected": ">=",
"version_name": "17.3",
"version_value": "17.3R3-S3"
},
{
"version_affected": "<",
"version_name": "17.3",
"version_value": "17.3R3-S8"
},
{
"version_affected": ">=",
"version_name": "17.4",
"version_value": "17.4R2-S4, 17.4R3"
},
{
"version_affected": "<",
"version_name": "17.4",
"version_value": "17.4R2-S10, 17.4R3-S2"
},
{
"version_affected": ">=",
"version_name": "18.1",
"version_value": "18.1R3-S6"
},
{
"version_affected": "<",
"version_name": "18.1",
"version_value": "18.1R3-S10"
},
{
"version_affected": ">=",
"version_name": "18.2",
"version_value": "18.2R3"
},
{
"version_affected": "<",
"version_name": "18.2",
"version_value": "18.2R3-S4"
},
{
"version_affected": ">=",
"version_name": "18.2X75",
"version_value": "18.2X75-D50, 18.2X75-D60"
},
{
"version_affected": "<",
"version_name": "18.2X75",
"version_value": "18.2X75-D53, 18.2X75-D65"
},
{
"version_affected": ">=",
"version_name": "18.3",
"version_value": "18.3R2"
},
{
"version_affected": "<",
"version_name": "18.3",
"version_value": "18.3R2-S4, 18.3R3-S2"
},
{
"version_affected": ">=",
"version_name": "18.4",
"version_value": "18.4R2"
},
{
"version_affected": "<",
"version_name": "18.4",
"version_value": "18.4R2-S5, 18.4R3-S2"
},
{
"version_affected": ">=",
"version_name": "19.1",
"version_value": "19.1R1"
},
{
"version_affected": "<",
"version_name": "19.1",
"version_value": "19.1R2-S2, 19.1R3-S1"
},
{
"version_affected": ">=",
"version_name": "19.2",
"version_value": "19.2R1"
},
{
"version_affected": "<",
"version_name": "19.2",
"version_value": "19.2R1-S5, 19.2R2"
},
{
"version_affected": "<",
"version_name": "19.3",
"version_value": "19.3R2-S3, 19.3R3"
},
{
"version_affected": "<",
"version_name": "19.4",
"version_value": "19.4R1-S3, 19.4R2"
},
{
"version_affected": "<",
"version_name": "20.1",
"version_value": "20.1R1-S2, 20.1R2"
},
{
"version_affected": "!<",
"version_value": "17.2R3-S3"
}
]
}
},
{
"product_name": "Junos OS Evolved",
"version": {
"version_data": [
{
"version_affected": "=",
"version_name": "19.4-EVO",
"version_value": "19.4-EVO"
},
{
"version_affected": "<",
"version_name": "20.1-EVO",
"version_value": "20.1R2-EVO"
}
]
}
}
]
},
"vendor_name": "Juniper Networks"
}
]
}
},
"configuration": [
{
"lang": "eng",
"value": "The example of the configuration stanza affected by this issue is as follows:\n [protocols bgp damping]\n\nused in combination with accepted-prefix-limit configuration:\n [protocols bgp ... accepted-prefix-limit]\n"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"-Synchronized-Data."
2020-10-16 21:01:46 +00:00
"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."
Juniper JSA publication 2020-10. See https://advisory.juniper.net for more information.
2020-10-16 22:15:32 +02:00
}
]
},
"exploit": [
{
"lang": "eng",
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"generator": {
"engine": "Vulnogram 0.0.9"
},
"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"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-20 Improper Input Validation"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://kb.juniper.net/JSA11059",
"refsource": "CONFIRM",
"url": "https://kb.juniper.net/JSA11059"
}
]
},
"solution": [
{
"lang": "eng",
"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."
}
],
"source": {
"advisory": "JSA11059",
"defect": [
"1490079"
],
"discovery": "USER"
},
"work_around": [
{
"lang": "eng",
"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 <TEARDOWN_VALUE> idle-timeout <IDLE_TIMEOUT_VALUE>]\nThe BGP damping max-suppress time configured under:\n [protocol bgp damping... max-suppress <MAX_SUPPRES_VALUE>]\nThe <IDLE_TIMEOUT_VALUE> needs to be higher than <MAX_SUPPRES_VALUE>\n"
}
]
}
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