An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a NULL pointer dereference in preauthenticated() that can be triggered with a crafted GET HTTP request with a missing redirect query string parameter. Triggering this issue results in crashing OpenNDS (a Denial-of-Service condition). Affected OpenNDS Captive Portal before version 10.1.2 fixed infixed in OpenWrt master, OpenWrt 23.05 and OpenWrt 22.03 on28. August 2023 by updating OpenNDS to version 10.1.3.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Captive_portal | Opennds | * | 10.1.2 (excluding) |
| Opennds | Ubuntu | bionic | * |
| Opennds | Ubuntu | lunar | * |
| Opennds | Ubuntu | mantic | * |
| Opennds | Ubuntu | trusty | * |
| Opennds | Ubuntu | upstream | * |
| Opennds | Ubuntu | xenial | * |
Potential Mitigations
References
- https://github.com/openNDS/openNDS/releases/tag/v10.1.2
- https://github.com/openwrt/routing/commit/0b19771fb2dd81e7c428759610aed583171eed80
- https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2023-006-v4/#sthash.2vJg3d85.rwx82g1C.dpbs
- https://github.com/openNDS/openNDS/releases/tag/v10.1.2
- https://github.com/openwrt/routing/commit/0b19771fb2dd81e7c428759610aed583171eed80
- https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2023-006-v4/#sthash.2vJg3d85.rwx82g1C.dpbs