Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 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: partial
Summary
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Juniper DHCP service (jdhcpd) of Juniper Networks Junos OS and Junos OS Evolved allows a DHCP client in one subnet to exhaust the address pools of other subnets, leading to a Denial of Service (DoS) on the downstream DHCP server. By default, the DHCP relay agent inserts its own Option 82 information when forwarding client requests, optionally replacing any Option 82 information provided by the client. When a specific DHCP DISCOVER is received in 'forward-only' mode with Option 82, the device should drop the message unless 'trust-option82' is configured. Instead, the DHCP relay forwards these packets to the DHCP server unmodified, which uses up addresses in the DHCP server's address pool, ultimately leading to address pool exhaustion. This issue affects Junos OS: • all versions before 21.2R3-S10, • from 21.4 before 21.4R3-S12, • all versions of 22.2, • from 22.4 before 22.4R3-S8, • from 23.2 before 23.2R2-S5, • from 23.4 before 23.4R2-S6, • from 24.2 before 24.2R2-S2, • from 24.4 before 24.4R2, • from 25.2 before 25.2R1-S1, 25.2R2. Junos OS Evolved: • all versions before 21.4R3-S12-EVO, • all versions of 22.2-EVO, • from 22.4 before 22.4R3-S8-EVO, • from 23.2 before 23.2R2-S5-EVO, • from 23.4 before 23.4R2-S6-EVO, • from 24.2 before 24.2R2-S2-EVO, • from 24.4 before 24.4R2-EVO, • from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Juniper Networks Junos OS
fixed in 21.2R3-S10; From 21.4 · fixed in 21.4R3-S12; From 22.2; From 22.4 · fixed in 22.4R3-S8; From 23.2 · fixed in 23.2R2-S5; From 23.4 · fixed in 23.4R2-S6; From 24.2 · fixed in 24.2R2-S2; From 24.4 · fixed in 24.4R2
- Juniper Networks Junos OS Evolved
fixed in 21.4R3-S12-EVO; From 22.2; From 22.4 · fixed in 22.4R3-S8-EVO; From 23.2 · fixed in 23.2R2-S5-EVO; From 23.4 · fixed in 23.4R2-S6-EVO; From 24.2 · fixed in 24.2R2-S2-EVO; From 24.4 · fixed in 24.4R2-EVO