Junos OS and Junos OS Evolved: BGP multipath incremental calculation is resulting in an rpd crash
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, and 8 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to inject incremental routing updates when BGP multipath is enabled, causing rpd to crash and restart, resulting in a Denial of Service (DoS). Since this is a timing issue (race condition), the successful exploitation of this vulnerability is outside the attacker's control. However, continued receipt and processing of this packet may create a sustained Denial of Service (DoS) condition. On all Junos OS and Junos OS Evolved platforms with BGP multipath enabled, a specific multipath calculation removes the original next hop from the multipath lead routes nexthop-set. When this change happens, multipath relies on certain internal timing to record the update. Under certain circumstance and with specific timing, this could result in an rpd crash. This issue only affects systems with BGP multipath enabled. This issue affects: Junos OS: • All versions of 21.1 • from 21.2 before 21.2R3-S7, • from 21.4 before 21.4R3-S6, • from 22.1 before 22.1R3-S5, • from 22.2 before 22.2R3-S3, • from 22.3 before 22.3R3-S2, • from 22.4 before 22.4R3, • from 23.2 before 23.2R2. Junos OS Evolved: • All versions of 21.1-EVO, • All versions of 21.2-EVO, • from 21.4-EVO before 21.4R3-S6-EVO, • from 22.1-EVO before 22.1R3-S5-EVO, • from 22.2-EVO before 22.2R3-S3-EVO, • from 22.3-EVO before 22.3R3-S2-EVO, • from 22.4-EVO before 22.4R3-EVO, • from 23.2-EVO before 23.2R2-EVO. Versions of Junos OS before 21.1R1 are unaffected by this vulnerability. Versions of Junos OS Evolved before 21.1R1-EVO are unaffected by this vulnerability.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Juniper Networks Junos OS
From 21.1; From 21.2 · fixed in 21.2R3-S7; From 21.4 · fixed in 21.4R3-S6; From 22.1 · fixed in 22.1R3-S5; From 22.2 · fixed in 22.2R3-S3; From 22.3 · fixed in 22.3R3-S2; From 22.4 · fixed in 22.4R3; From 23.2 · fixed in 23.2R2
- Juniper Networks Junos OS Evolved
From 21.1-EVO; From 21.2-EVO; From 21.4-EVO · fixed in 21.4R3-S6-EVO; From 22.1-EVO · fixed in 22.1R3-S5-EVO; From 22.2-EVO · fixed in 22.2R3-S3-EVO; From 22.3-EVO · fixed in 22.3R3-S2-EVO; From 22.4-EVO · fixed in 22.4R3-EVO; From 23.2-EVO · fixed in 23.2R2-EVO