Junos OS and Junos OS Evolved: Receipt of a specific malformed BGP update causes the session to reset
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 21.4R3-S8, 22.2R3-S4, 22.3R3-S3, 22.4R3-S3, 23.2R2-S1, and 5 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: yes
- Technical impact: partial
Summary
An Improper Handling of Exceptional Conditions vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an attacker sending a specific malformed BGP update message to cause the session to reset, resulting in a Denial of Service (DoS). Continued receipt and processing of these malformed BGP update messages will create a sustained Denial of Service (DoS) condition. Upon receipt of a BGP update message over an established BGP session containing a specifically malformed tunnel encapsulation attribute, when segment routing is enabled, internal processing of the malformed attributes within the update results in improper parsing of remaining attributes, leading to session reset: BGP SEND Notification code 3 (Update Message Error) subcode 1 (invalid attribute list) Only systems with segment routing enabled are vulnerable to this issue. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations, and requires a remote attacker to have at least one established BGP session. This issue affects: Junos OS: • All versions before 21.4R3-S8, • from 22.2 before 22.2R3-S4, • from 22.3 before 22.3R3-S3, • from 22.4 before 22.4R3-S3, • from 23.2 before 23.2R2-S1, • from 23.4 before 23.4R1-S2, 23.4R2. Junos OS Evolved: • All versions before 21.4R3-S8-EVO, • from 22.2-EVO before 22.2R3-S4-EVO, • from 22.3-EVO before 22.3R3-S3-EVO, • from 22.4-EVO before 22.4R3-S3-EVO, • from 23.2-EVO before 23.2R2-S1-EVO, • from 23.4-EVO before 23.4R1-S2-EVO, 23.4R2-EVO.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Juniper Networks Junos OS
fixed in 21.4R3-S8; From 22.2 · fixed in 22.2R3-S4; From 22.3 · fixed in 22.3R3-S3; From 22.4 · fixed in 22.4R3-S3; From 23.2 · fixed in 23.2R2-S1
- Juniper Networks Junos OS Evolved
fixed in 21.4R3-S8-EVO; From 22.2-EVO · fixed in 22.2R3-S4-EVO; From 22.3-EVO · fixed in 22.3R3-S3-EVO; From 22.4-EVO · fixed in 22.4R3-S3-EVO; From 23.2-EVO · fixed in 23.2R2-S1-EVO