In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function find_cc() in asm/preproc.c that will cause a remote denial of service attack, because pointers associated with skip_white_ calls are not validated.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Netwide_assembler | Nasm | 2.14-rc0 (including) | 2.14-rc0 (including) |
| Nasm | Ubuntu | artful | * |
| Nasm | Ubuntu | esm-apps/xenial | * |
| Nasm | Ubuntu | trusty | * |
| Nasm | Ubuntu | upstream | * |
| Nasm | Ubuntu | xenial | * |
Potential Mitigations
References
- http://repo.or.cz/nasm.git/commit/7524cfd91492e6e3719b959498be584a9ced13af
- https://bugzilla.nasm.us/show_bug.cgi?id=3392435
- https://usn.ubuntu.com/3694-1/
- http://repo.or.cz/nasm.git/commit/7524cfd91492e6e3719b959498be584a9ced13af
- https://bugzilla.nasm.us/show_bug.cgi?id=3392435
- https://usn.ubuntu.com/3694-1/