---
title: "CVE-2023-1672\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2023-1672?format=md
keywords: index, follow
---

# CVE-2023-1672

Publication date 11 July 2023

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2023-1672?format=md#impact-score)

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## Description

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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2023-1672?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tang | 23.10 mantic | Not affected |
| 23.04 lunar | Fixed 11-2ubuntu0.1 |
| 22.10 kinetic | Ignored end of life, was needed |
| 22.04 LTS jammy | Fixed 11-1ubuntu0.1 |
| 20.04 LTS focal | Fixed 7-1ubuntu0.2 |
| 18.04 LTS bionic | Fixed 6-1ubuntu0.1~esm1  Ubuntu Pro |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2023-1672?format=md#patch-details)

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## Notes

---

### [alexmurray](https://launchpad.net/~alexmurray)

For tang 6 and 7 in bionic and focal respectively, the code
from src/keys.c and src/tangd-rotate-keys.in is not present, however there
is an equivalent src/tangd-keygen script which looks like it needs to be
updated to set the umask correctly

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| tang | * Upstream:   [8dbbed1](https://github.com/latchset/tang/commit/8dbbed10870378f1b2c3cf3df2ea7edca7617096) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Adjacent |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1672)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-1672)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-1672)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2023-1672)

### Related Ubuntu Security Notices (USN)

+ [USN-6489-1](https://usn.ubuntu.com/USN-6489-1)
+ Tang vulnerability
+ 20 November 2023

### Other references

* <https://seclists.org/oss-sec/2023/q2/231>
* <https://github.com/latchset/tang/pull/123/commits/05b12d14f7945b898235558af0bbaa43c582ccdd>
* <https://www.cve.org/CVERecord?id=CVE-2023-1672>