In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the options refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Dhcp | Isc | 4.4.0 (including) | 4.4.3 (including) |
| Dhcp | Isc | 4.1-esv-r1 (including) | 4.1-esv-r1 (including) |
| Dhcp | Isc | 4.1-esv-r10 (including) | 4.1-esv-r10 (including) |
| Dhcp | Isc | 4.1-esv-r10_b1 (including) | 4.1-esv-r10_b1 (including) |
| Dhcp | Isc | 4.1-esv-r10_rc1 (including) | 4.1-esv-r10_rc1 (including) |
| Dhcp | Isc | 4.1-esv-r10b1 (including) | 4.1-esv-r10b1 (including) |
| Dhcp | Isc | 4.1-esv-r10rc1 (including) | 4.1-esv-r10rc1 (including) |
| Dhcp | Isc | 4.1-esv-r11 (including) | 4.1-esv-r11 (including) |
| Dhcp | Isc | 4.1-esv-r11_b1 (including) | 4.1-esv-r11_b1 (including) |
| Dhcp | Isc | 4.1-esv-r11_rc1 (including) | 4.1-esv-r11_rc1 (including) |
| Dhcp | Isc | 4.1-esv-r11_rc2 (including) | 4.1-esv-r11_rc2 (including) |
| Dhcp | Isc | 4.1-esv-r11b1 (including) | 4.1-esv-r11b1 (including) |
| Dhcp | Isc | 4.1-esv-r11rc1 (including) | 4.1-esv-r11rc1 (including) |
| Dhcp | Isc | 4.1-esv-r11rc2 (including) | 4.1-esv-r11rc2 (including) |
| Dhcp | Isc | 4.1-esv-r12 (including) | 4.1-esv-r12 (including) |
| Dhcp | Isc | 4.1-esv-r12-p1 (including) | 4.1-esv-r12-p1 (including) |
| Dhcp | Isc | 4.1-esv-r12_b1 (including) | 4.1-esv-r12_b1 (including) |
| Dhcp | Isc | 4.1-esv-r12_p1 (including) | 4.1-esv-r12_p1 (including) |
| Dhcp | Isc | 4.1-esv-r12b1 (including) | 4.1-esv-r12b1 (including) |
| Dhcp | Isc | 4.1-esv-r13 (including) | 4.1-esv-r13 (including) |
| Dhcp | Isc | 4.1-esv-r13_b1 (including) | 4.1-esv-r13_b1 (including) |
| Dhcp | Isc | 4.1-esv-r13b1 (including) | 4.1-esv-r13b1 (including) |
| Dhcp | Isc | 4.1-esv-r14 (including) | 4.1-esv-r14 (including) |
| Dhcp | Isc | 4.1-esv-r14_b1 (including) | 4.1-esv-r14_b1 (including) |
| Dhcp | Isc | 4.1-esv-r14b1 (including) | 4.1-esv-r14b1 (including) |
| Dhcp | Isc | 4.1-esv-r15 (including) | 4.1-esv-r15 (including) |
| Dhcp | Isc | 4.1-esv-r15-p1 (including) | 4.1-esv-r15-p1 (including) |
| Dhcp | Isc | 4.1-esv-r15_b1 (including) | 4.1-esv-r15_b1 (including) |
| Dhcp | Isc | 4.1-esv-r16 (including) | 4.1-esv-r16 (including) |
| Dhcp | Isc | 4.1-esv-r16-p1 (including) | 4.1-esv-r16-p1 (including) |