Junos OS and Junos OS Evolved: RPD crash when attempting to send a very long AS PATH to a non-4-byte-AS capable BGP neighbor
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, and 7 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 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. This 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. Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability. This issue affects: Juniper Networks Junos OS: • All versions prior to 20.4R3-S8; • 21.1 versions 21.1R1 and later; • 21.2 versions prior to 21.2R3-S6; • 21.3 versions prior to 21.3R3-S5; • 21.4 versions prior to 21.4R3-S5; • 22.1 versions prior to 22.1R3-S4; • 22.2 versions prior to 22.2R3-S2; • 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; • 22.4 versions prior to 22.4R2-S1, 22.4R3. Juniper Networks Junos OS Evolved • All versions prior to 20.4R3-S8-EVO; • 21.1 versions 21.1R1-EVO and later; • 21.2 versions prior to 21.2R3-S6-EVO; • 21.3 versions prior to 21.3R3-S5-EVO; • 21.4 versions prior to 21.4R3-S5-EVO; • 22.1 versions prior to 22.1R3-S4-EVO; • 22.2 versions prior to 22.2R3-S2-EVO; • 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO; • 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-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 20.4R3-S8; From 21.1R1; From 21.2 · fixed in 21.2R3-S6; From 21.3 · fixed in 21.3R3-S5; From 21.4 · fixed in 21.4R3-S5; From 22.1 · fixed in 22.1R3-S4; From 22.2 · fixed in 22.2R3-S2
- Juniper Networks Junos OS Evolved
fixed in 20.4R3-S8-EVO; From 21.1; From 21.2 · fixed in 21.2R3-S6-EVO; From 21.3 · fixed in 21.3R3-S5-EVO; From 21.4 · fixed in 21.4R3-S5-EVO; From 22.1 · fixed in 22.1R3-S4-EVO; From 22.2 · fixed in 22.2R3-S2-EVO