An issue was discovered in InspIRCd 2 before 2.0.29 and 3 before 3.6.0. The pgsql module contains a use after free vulnerability. When combined with the sqlauth or sqloper modules, this vulnerability can be used for remote crashing of an InspIRCd server by any user able to connect to a server.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Inspircd | Inspircd | 2.0 (including) | 2.0.29 (excluding) |
| Inspircd | Inspircd | 3.0 (including) | 3.6.0 (excluding) |
| Inspircd | Ubuntu | bionic | * |
| Inspircd | Ubuntu | esm-apps/bionic | * |
| Inspircd | Ubuntu | esm-apps/focal | * |
| Inspircd | Ubuntu | esm-apps/xenial | * |
| Inspircd | Ubuntu | focal | * |
| Inspircd | Ubuntu | groovy | * |
| Inspircd | Ubuntu | hirsute | * |
| Inspircd | Ubuntu | impish | * |
| Inspircd | Ubuntu | kinetic | * |
| Inspircd | Ubuntu | lunar | * |
| Inspircd | Ubuntu | mantic | * |
| Inspircd | Ubuntu | trusty | * |
| Inspircd | Ubuntu | upstream | * |
| Inspircd | Ubuntu | xenial | * |
Potential Mitigations
References
- https://docs.inspircd.org/security/2020-01/
- https://github.com/inspircd/inspircd/compare/426d1c8...b3f1db9
- https://github.com/inspircd/inspircd/compare/v2.0.28...07d7dea
- https://lists.debian.org/debian-lts-announce/2020/09/msg00015.html
- https://www.debian.org/security/2020/dsa-4764
- https://docs.inspircd.org/security/2020-01/
- https://github.com/inspircd/inspircd/compare/426d1c8...b3f1db9
- https://github.com/inspircd/inspircd/compare/v2.0.28...07d7dea
- https://lists.debian.org/debian-lts-announce/2020/09/msg00015.html
- https://www.debian.org/security/2020/dsa-4764