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Fencer Vulns
medium 5.3

CVE-2023-1672 json

Race condition exists in the key generation and rotation functionality

published 2023-07-11 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-23900

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

A race condition exists in the Tang server functionality for key generation and key rotation. This flaw results in a small time window where Tang private keys become readable by other processes on the same host.

Patch / fix

  • tang_project tang 14
  • tang Debian 12 11-2+deb12u1
  • tang Debian 14, Debian 13 14-1

debian advisories DEBIAN-CVE-2023-1672

  • tang Ubuntu 20.04 LTS 7-1ubuntu0.2
  • tang Ubuntu 22.04 LTS 11-1ubuntu0.1
  • tang Ubuntu Pro 18.04 LTS 6-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2023-1672

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tang RHEL 8 7-8.el8
  • tang RHEL 9 14-2.el9

red hat advisories RHSA-2023:7022RHSA-2023:6492

  • tang AlmaLinux 8 7-8.el8
  • tang AlmaLinux 9 14-2.el9

almalinux advisories ALSA-2023:7022ALSA-2023:6492

  • tang Rocky Linux 8 7-8.el8

rocky linux advisories RLSA-2023:7022

  • tang CBL-Mariner 2.0 14-1

azure linux advisories AZL-27405

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-1672 updated cvss 5.3

tang: Race condition exists in the key generation and rotation functionality

  • Red Hat Enterprise Linux 7 tang, tang-nagios
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) tang 7-8.el8
    fixed: vendor fix RHSA-2023:7022
  • Red Hat Enterprise Linux AppStream (v. 9) tang 14-2.el9
    fixed: vendor fix RHSA-2023:6492

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com https://www.openwall.com/lists/oss-security/2023/06/15/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • n/a tang
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.