---
title: "CVE-2015-7758\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-2015-7758?format=md
keywords: index, follow
---

# CVE-2015-7758

Publication date 8 January 2016

Last updated 22 May 2026

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**3.3 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2015-7758?format=md#impact-score)

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## Description

Gummi 0.6.5 allows local users to write to arbitrary files via a symlink
attack on a temporary dot file that uses the name of an existing file and a
(1) .aux, (2) .log, (3) .out, (4) .pdf, or (5) .toc extension for the file
name, as demonstrated by .thesis.tex.aux.

### From the Ubuntu Security Team

It was discovered that Gummi created unsafe, predictable filenames in /tmp,
resulting in a race condition. An attacker could use this vulnerability to
overwrite arbitrary files.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| gummi | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Ignored end of life |
| 17.04 zesty | Ignored end of life |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Ignored end of life |
| 15.04 vivid | Ignored end of life |
| 14.04 LTS trusty | Fixed 0.6.5-3+deb8u2build0.14.04.1 |
| 12.04 LTS precise | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

3.3 · Low

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 3.3 · Low |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7758)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-7758)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-7758)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-7758)

### Other references

* <http://www.openwall.com/lists/oss-security/2015/10/08/4>
* <https://www.cve.org/CVERecord?id=CVE-2015-7758>