The remote Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-a4c606585e advisory.

  - When a transaction is committed, C Xenstored will first check the quota is correct before attempting to     commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed     outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot     be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built     without -DNDEBUG (this is the default). (CVE-2023-34323)

  - [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities     correspond to which CVE.] libfsimage contains parsing code for several filesystems, most of them based on     grub-legacy code. libfsimage is used by pygrub to inspect guest disks. Pygrub runs as the same user as the     toolstack (root in a priviledged domain). At least one issue has been reported to the Xen Security Team     that allows an attacker to trigger a stack buffer overflow in libfsimage. After further analisys the Xen     Security Team is no longer confident in the suitability of libfsimage when run against guest controlled     input with super user priviledges. In order to not affect current deployments that rely on pygrub patches     are provided in the resolution section of the advisory that allow running pygrub in deprivileged mode.
    CVE-2023-4949 refers to the original issue in the upstream grub project (An attacker with local access to     a system (either through a disk or external drive) can present a modified XFS partition to grub-legacy in     such a way to exploit a memory corruption in grub's XFS file system implementation.) CVE-2023-34325     refers specifically to the vulnerabilities in Xen's copy of libfsimage, which is decended from a very old     version of grub. (CVE-2023-34325)

  - The caching invalidation guidelines from the AMD-Vi specification (48882Rev 3.07-PUBOct 2022) is     incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE     are updated but the IOMMU TLB is not flushed. Such stale DMA mappings can point to memory ranges not owned     by the guest, thus allowing access to unindented memory regions. (CVE-2023-34326)

  - [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities     correspond to which CVE.] AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen     supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest     state, leading to denials of service. 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context     of a previous vCPUs debug mask state. 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live     GDT. This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock up the CPU entirely.
    (CVE-2023-34327, CVE-2023-34328)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Fedora 38 : xen (2023-a4c606585e)

high Nessus Plugin ID 183905

Version 1.3