PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Upx | Upx | 3.95 (including) | 3.95 (including) |
| Upx-ucl | Ubuntu | artful | * |
| Upx-ucl | Ubuntu | bionic | * |
| Upx-ucl | Ubuntu | cosmic | * |
| Upx-ucl | Ubuntu | disco | * |
| Upx-ucl | Ubuntu | eoan | * |
| 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
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00008.html
- https://github.com/upx/upx/blob/devel/NEWS
- https://github.com/upx/upx/issues/206
- https://github.com/upx/upx/issues/207
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D7XU42G6MUQQXHWRP7DCF2JSIBOJ5GOO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUTVSTXAFTD552NO2K2RIF6MDQEHP3BE/
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00008.html
- https://github.com/upx/upx/blob/devel/NEWS
- https://github.com/upx/upx/issues/206
- https://github.com/upx/upx/issues/207
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D7XU42G6MUQQXHWRP7DCF2JSIBOJ5GOO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUTVSTXAFTD552NO2K2RIF6MDQEHP3BE/