Ubuntu Security Notice USN-129-1
18th May, 2005
squid vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 5.04
- Ubuntu 4.10
Details
It was discovered that Squid did not verify the validity of DNS server
responses. When Squid is started, it opens a DNS client UDP port whose
number is randomly assigned by the operating system. Unless your
network firewall is configured to accept DNS responses only from known
good nameservers, this vulnerability allowed users within the local
network to inject arbitrary DNS responses into Squid ("DNS spoofing").
This could be used to present different web pages to users from those
they actually requested.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 5.04:
- squid
- Ubuntu 4.10:
- squid
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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