---
title: "CVE-2011-2766\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-2011-2766?format=md
keywords: index, follow
---

# CVE-2011-2766

Publication date 23 September 2011

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

The FCGI (aka Fast CGI) module 0.70 through 0.73 for Perl, as used by
CGI::Fast, uses environment variable values from one request during
processing of a later request, which allows remote attackers to bypass
authentication via crafted HTTP headers.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-2766?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libfcgi-perl | 13.04 raring | Not affected |
| 12.10 quantal | Not affected |
| 12.04 LTS precise | Not affected |
| 11.10 oneiric | Ignored end of life |
| 11.04 natty | Fixed 0.71-1+squeeze1build0.11.04.1 |
| 10.10 maverick | Fixed 0.71-1+squeeze1build0.10.10.1 |
| 10.04 LTS lucid | Not affected |
| 8.04 LTS hardy | Not affected |

---

* [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-2011-2766?format=md#patch-details)

## Notes

---

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

Per Debian, introduced in 0.70

### 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 |
| --- | --- |
| libfcgi-perl | * Other:   <https://rt.cpan.org/Public/Bug/Display.html?id=68380> * Vendor:   <http://www.debian.org/security/2011/dsa-2327> * Upstream:   <http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=catagits%2Ffcgi2.git;a=commitdiff_plain;h=297693dc8362d25bb25e473899c72508a0f71d2e> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2766)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-2766)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-2766)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-2766)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2011-2766>