OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Openwrt Openwrt
cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*
|
— |
25.12.5
|
References 5
https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a
security-advisories@github.com
https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e…
security-advisories@github.com
https://github.com/openwrt/odhcpd/pull/404
security-advisories@github.com
https://github.com/openwrt/openwrt/releases/tag/v25.12.5
security-advisories@github.com
https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f
security-advisories@github.com