Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET). A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called "shadow stacks", holding little more than return addresses. Shadow stacks aren't writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack.
In particular certain memory accesses need intercepting by Xen. In various cases the necessary emulation involves kind of replaying of the instruction. Such replaying typically involves filling and then invoking of a stub. Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly.
Unfortunately the interaction of both of the above wasn't right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Mar 20, 2024 |
| Debian | — | Upgrade xen | Dec 30, 2024 | Mar 20, 2024 |
| Gentoo Linux | — | Upgrade app-emulation/xen. | Sep 23, 2024 | Mar 20, 2024 |
| Suse | — | Upgrade xen-tools-xendomains-wait-diskUpgrade xen-develUpgrade xen-tools-domUUpgrade xenUpgrade xen-toolsUpgrade xen-libs-32bitUpgrade xen-libsUpgrade xen-doc-html | Mar 12, 2024 | Mar 11, 2024 |
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