---
title: "CVE-2009-4492\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-2009-4492?format=md
keywords: index, follow
---

# CVE-2009-4492

Publication date 13 January 2010

Last updated 24 July 2024

---

Ubuntu priority

**Negligible**

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

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## Description

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through
patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes
data to a log file without sanitizing non-printable characters, which might
allow remote attackers to modify a window's title, or possibly execute
arbitrary commands or overwrite files, via an HTTP request containing an
escape sequence for a terminal emulator.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2009-4492?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| ruby1.8 | 11.10 oneiric | Not affected |
| 11.04 natty | Not affected |
| 10.10 maverick | Not affected |
| 10.04 LTS lucid | Not affected |
| 9.10 karmic | Ignored end of life |
| 9.04 jaunty | Ignored end of life |
| 8.10 intrepid | Ignored end of life, was needed |
| 8.04 LTS hardy | Ignored end of life |
| 6.06 LTS dapper | Ignored end of life |
| ruby1.9 | 11.10 oneiric | Not in release |
| 11.04 natty | Not in release |
| 10.10 maverick | Not in release |
| 10.04 LTS lucid | Fixed 1.9.0.5-1ubuntu2 |
| 9.10 karmic | Fixed 1.9.0.5-1ubuntu1.2 |
| 9.04 jaunty | Fixed 1.9.0.2-9ubuntu1.2 |
| 8.10 intrepid | Fixed 1.9.0.2-7ubuntu1.3 |
| 8.04 LTS hardy | Ignored end of life |
| 6.06 LTS dapper | Ignored end of life |
| ruby1.9.1 | 11.10 oneiric | Not affected |
| 11.04 natty | Not affected |
| 10.10 maverick | Not affected |
| 10.04 LTS lucid | Not affected |
| 9.10 karmic | Ignored end of life |
| 9.04 jaunty | Not in release |
| 8.10 intrepid | Not in release |
| 8.04 LTS hardy | Not in release |
| 6.06 LTS dapper | 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-2009-4492?format=md#patch-details)

## Notes

---

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

if there is a problem, it is the terminal that has the issue

### 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 |
| --- | --- |
| ruby1.8 | * Upstream:   <http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26267> * Upstream:   <http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26281> |
| ruby1.9 | * Upstream:   <http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26267> * Upstream:   <http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26281> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4492)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2009-4492)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2009-4492)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2009-4492)

### Related Ubuntu Security Notices (USN)

+ [USN-900-1](https://usn.ubuntu.com/USN-900-1)
+ Ruby vulnerabilities
+ 16 February 2010

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2009-4492>