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CVE-2023-34058

25
FAUCET Score

CVE-2023-34058 is a SAML token signature bypass vulnerability in VMware Tools, affecting products from Debian, Fedora Project, Microsoft, and VMware. An attacker with Guest Operation Privileges on a virtual machine can elevate their privileges if that VM has a more privileged Guest Alias assigned. The vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-adjacent attack vector with high impact on confidentiality, integrity, and availability, but also high attack complexity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 11.0.0, <= 12.3.0CPE matchmatch criteria
cpe:2.3:a:vmware:open_vm_tools:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
12.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
>= 10.3.0, < 12.3.5CPE matchmatch criteria
cpe:2.3:a:vmware:tools:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.67%
Probability of exploitation in next 30 days
EPSS Percentile
48.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0067 is in the 60th percentile among its peer group of 239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (16)

microsoftpatch availablevia msrc
Product: cbl2 open-vm-tools 11.3.0-3 on CBL Mariner 2.0Fixed in: 11.3.0-3
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: open-vm-tools-0:11.0.5-3.el7_9.9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: open-vm-tools-0:12.2.5-3.el8_9.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: open-vm-tools-0:10.3.10-3.el8_1.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: open-vm-tools-0:11.0.0-4.el8_2.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceFixed in: open-vm-tools-0:11.0.0-4.el8_2.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsFixed in: open-vm-tools-0:11.0.0-4.el8_2.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: open-vm-tools-0:11.2.0-2.el8_4.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: open-vm-tools-0:11.2.0-2.el8_4.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: open-vm-tools-0:11.3.5-1.el8_6.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: open-vm-tools-0:12.1.5-2.el8_8.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: open-vm-tools-0:12.2.5-3.el9_3.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: open-vm-tools-0:11.3.5-1.el9_0.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: open-vm-tools-0:12.1.5-1.el9_2.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: open-vm-tools-0:11.2.0-2.el8_4.4
View patch
vmwarevendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

redhatCVE-2023-34058Important

open-vm-tools: SAML token signature bypass

Oct 26, 2023
microsoft2023-Oct/CVE-2023-34058Important

VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Guest Operation Privileges https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.html  in a target virtual machine may be able to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias https://vdc-download.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/vim.vm.guest.AliasManager.html .

Oct 10, 2023

References

lists.debian.org / debian-lts-announce/2023/11/msg00002.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/G7G77Z76CQPGUF7VHRA6O3UFCMPPR4O2
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/MQUOFQL2SNNNMKROQ3TZQY4HEYMNOIBW
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/WLTKVTRKQW2GD2274H3UOW6XU4E62GSK
Mailing ListThird Party Advisory
debian.org / security/2023/dsa-5543
Third Party Advisory
vmware.com / security/advisories/VMSA-2023-0024.html
Vendor Advisory
openwall.com / lists/oss-security/2023/10/27/1
Mailing ListPatch