[Pkg-xen-devel] Bug#1034842: xen: CVE-2022-42335 (XSA-430)

[Salvatore Bonaccorso]

Source: xen
Version: 4.17.0+74-g3eac216e6e-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for xen, affects only 4.17.

Filling as RC, to make it on the radar for the bookworm release (and
make IMHO sense to try to get it in before release).

CVE-2022-42335[0]:
| x86 shadow paging arbitrary pointer dereference In environments where
| host assisted address translation is necessary but Hardware Assisted
| Paging (HAP) is unavailable, Xen will run guests in so called shadow
| mode. Due to too lax a check in one of the hypervisor routines used
| for shadow page handling it is possible for a guest with a PCI device
| passed through to cause the hypervisor to access an arbitrary pointer
| partially under guest control.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2022-42335
    https://www.cve.org/CVERecord?id=CVE-2022-42335
[1] https://www.openwall.com/lists/oss-security/2023/04/25/1
[2] https://xenbits.xen.org/xsa/advisory-430.html

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore