USN-1801-1: curl vulnerability

16 April 2013

curl vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


Applications using libcurl could be made to expose sensitive information over the network.

Software Description

  • curl - HTTP, HTTPS, and FTP client and client libraries


YAMADA Yasuharu discovered that libcurl was vulnerable to a cookie leak when doing requests across domains with matching tails. curl did not properly restrict cookies to domains and subdomains. If a user or automated system were tricked into processing a specially crafted URL, an attacker could read cookie values stored by unrelated webservers.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 12.10
curl - 7.27.0-1ubuntu1.2
libcurl3 - 7.27.0-1ubuntu1.2
Ubuntu 12.04 LTS
curl - 7.22.0-3ubuntu4.1
libcurl3 - 7.22.0-3ubuntu4.1
Ubuntu 11.10
curl - 7.21.6-3ubuntu3.3
libcurl3 - 7.21.6-3ubuntu3.3
Ubuntu 10.04 LTS
curl - 7.19.7-1ubuntu1.2
libcurl3 - 7.19.7-1ubuntu1.2
Ubuntu 8.04 LTS
curl - 7.18.0-1ubuntu2.4
libcurl3 - 7.18.0-1ubuntu2.4

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.