---
title: "CVE-2019-12779\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-2019-12779?format=md
keywords: index, follow
---

# CVE-2019-12779

Publication date 7 June 2019

Last updated 21 May 2026

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**7.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2019-12779?format=md#impact-score)

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## Description

libqb before 1.0.5 allows local users to overwrite arbitrary files via a
symlink attack, because it uses predictable filenames (under /dev/shm and
/tmp) without O\_EXCL.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-12779?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libqb | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Ignored end of life |
| 18.10 cosmic | Ignored end of life |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Vulnerable |

---

* [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-2019-12779?format=md#patch-details)

## Notes

---

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

1.0.4 is problematic, 1.0.5 was released to fix it.
mitigated by symlink restrictions, low priority

### 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 |
| --- | --- |
| libqb | * Upstream:   [e322e98](https://github.com/ClusterLabs/libqb/commit/e322e98dc264bc5911d6fe1d371e55ac9f95a71e) * Upstream:   [7cd7b06](https://github.com/ClusterLabs/libqb/commit/7cd7b06d52ac80c343f362c7e39ef75495439dfc) * Upstream:   [6a4067c](https://github.com/ClusterLabs/libqb/commit/6a4067c1d1764d93d255eccecfd8bf9f43cb0b4d) * Upstream:   [269a0ca](https://github.com/ClusterLabs/libqb/commit/269a0ca00717d2f43f03be5f7b034d93fb33f473) * Upstream:   [f950a5d](https://github.com/ClusterLabs/libqb/commit/f950a5d3f8e07aa61bec3da91da01f06e762b138) * Upstream:   [65d6fb3](https://github.com/ClusterLabs/libqb/commit/65d6fb37a28f3b41f2e73c49214a4c9e3533f15a) * Upstream:   [1699bf4](https://github.com/ClusterLabs/libqb/commit/1699bf4e29a3ba42362c340520ed97efc313366d) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.1 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12779)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-12779)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-12779)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-12779)

### Other references

* <https://github.com/ClusterLabs/libqb/releases/tag/v1.0.4>
* <https://github.com/ClusterLabs/libqb/releases/tag/v1.0.5>
* <https://www.cve.org/CVERecord?id=CVE-2019-12779>