A flaw was found in QEMU in the implementation of the Pointer Authentication (PAuth) support for ARM introduced in version 4.0 and fixed in version 5.0.0. A general failure of the signature generation process caused every PAuth-enforced pointer to be signed with the same signature. A local attacker could obtain the signature of a protected pointer and abuse this flaw to bypass PAuth protection for all programs running on QEMU.
Weakness
The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Qemu | Qemu | 4.0.0 (including) | 5.0.0 (excluding) |
| Advanced Virtualization for RHEL 8.2.1 | RedHat | virt:8.2-8020120200707202843.11e3e113 | * |
| Advanced Virtualization for RHEL 8.2.1 | RedHat | virt-devel:8.2-8020120200707202843.11e3e113 | * |
| Qemu | Ubuntu | devel | * |
| Qemu | Ubuntu | eoan | * |
| Qemu | Ubuntu | esm-infra/focal | * |
| Qemu | Ubuntu | focal | * |
| Qemu | Ubuntu | trusty | * |
Related Attack Patterns
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10702
- https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=de0b1bae6461f67243282555475f88b2384a1eb9
- https://security.netapp.com/advisory/ntap-20200724-0007/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10702
- https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=de0b1bae6461f67243282555475f88b2384a1eb9
- https://security.netapp.com/advisory/ntap-20200724-0007/