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NVD / CVE Program· CNA XEN

CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: xen (Alpine:v3.15) 4.15.5-r3; xen (Alpine:v3.16) 4.16.5-r3; xen (Alpine:v3.18) 4.17.2-r3.

Low priority for now. Upgrade to xen (Alpine:v3.15) 4.15.5-r3; xen (Alpine:v3.16) 4.16.5-r3; xen (Alpine:v3.18) 4.17.2-r3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

[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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jan 5, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 17th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-34325

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xenxen

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • xen xenall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (XEN). Independent of NVD's CPE analysis and usually ahead of it.

  • Xen Xen

    • consult Xen advisory XSA-443unknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.15xenbefore 4.15.5-r34.15.5-r3
Alpine:v3.16xenbefore 4.16.5-r34.16.5-r3
Alpine:v3.18xenbefore 4.17.2-r34.17.2-r3
Debian:12xenbefore 4.17.2+76-ge1f9cb16e2-1~deb12u14.17.2+76-ge1f9cb16e2-1~deb12u1
Debian:13xenbefore 4.17.2+55-g0b56bed864-14.17.2+55-g0b56bed864-1
openSUSE:Leap 15.4xenbefore 4.16.5_06-150400.4.37.14.16.5_06-150400.4.37.1
openSUSE:Leap 15.5xenbefore 4.17.2_08-150500.3.15.14.17.2_08-150500.3.15.1
openSUSE:Leap 15.5xenbefore 4.17.2_06-150500.3.12.14.17.2_06-150500.3.12.1
openSUSE:Leap Micro 5.3xenbefore 4.16.5_08-150400.4.40.14.16.5_08-150400.4.40.1
openSUSE:Tumbleweedxenbefore 4.18.0_02-1.14.18.0_02-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSxenbefore 4.12.4_40-150100.3.95.14.12.4_40-150100.3.95.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSxenbefore 4.13.5_06-150200.3.80.14.13.5_06-150200.3.80.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOSxenbefore 4.14.6_06-150300.3.57.14.14.6_06-150300.3.57.1
SUSE:Linux Enterprise Micro 5.3xenbefore 4.16.5_06-150400.4.37.14.16.5_06-150400.4.37.1
SUSE:Linux Enterprise Micro 5.3xenbefore 4.16.5_08-150400.4.40.14.16.5_08-150400.4.40.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.2_06-150500.3.12.14.17.2_06-150500.3.12.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.2_08-150500.3.15.14.17.2_08-150500.3.15.1
SUSE:Linux Enterprise Software Development Kit 12 SP5xenbefore 4.12.4_40-3.97.14.12.4_40-3.97.1

Same product

xen: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-10921The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, whi
    41Plan
  • CVE-2017-10920The grant-table feature in Xen through 4.8.x mishandles a GNTMAP_device_map and GNTMAP_host_map mapping, when followed by only a GNTMAP_host
    41Plan
  • CVE-2017-10918Xen through 4.8.x does not validate memory allocations during certain P2M operations, which allows guest OS users to obtain privileged host
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-34322Jan 5, 2024 · top-level shadow reference dropped too early for 64-bit PV guests
    31Monitor
  • ← EarlierCVE-2023-34323Jan 5, 2024 · xenstored: A transaction conflict can crash C Xenstored
    22Monitor
  • Later →CVE-2023-34326Jan 5, 2024 · x86/AMD: missing IOMMU TLB flushing
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:xen4.15.5-r3 · Alpine:v3.15Package registry (OSV)
debian:xen4.17.2+76-ge1f9cb16e2-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:xen4.17.2_06-150500.3.12.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:xen4.17.2_06-150500.3.12.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-468350 days apartx86/AMD: mismatch in IOMMU quarantine page table levels
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records