Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Upx | Upx | 4.0.0 (including) | 4.0.0 (including) |
| Upx-ucl | Ubuntu | bionic | * |
| Upx-ucl | Ubuntu | focal | * |
| Upx-ucl | Ubuntu | groovy | * |
| Upx-ucl | Ubuntu | hirsute | * |
| Upx-ucl | Ubuntu | impish | * |
| Upx-ucl | Ubuntu | kinetic | * |
| Upx-ucl | Ubuntu | lunar | * |
| Upx-ucl | Ubuntu | mantic | * |
| Upx-ucl | Ubuntu | oracular | * |
| Upx-ucl | Ubuntu | plucky | * |
| Upx-ucl | Ubuntu | trusty | * |
| Upx-ucl | Ubuntu | xenial | * |
Potential Mitigations
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1948692
- https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc
- https://github.com/upx/upx/issues/485
- https://bugzilla.redhat.com/show_bug.cgi?id=1948692
- https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc
- https://github.com/upx/upx/issues/485