Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Opera telnet URI handler file creation/truncation vulnerability
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200405-19
(Opera telnet URI handler file creation/truncation vulnerability)
The telnet URI handler in Opera does not check for leading '-' characters
in the host name. Consequently, a maliciously-crafted telnet:// link may be
able to pass options to the telnet program itself. One example would be the
If MyFile exists in the user's home directory and the user clicking on the
link has write permissions to it, the contents of the file will be
overwritten with the output of the telnet trace information. If MyFile does
not exist, the file will be created in the user's home directory.
This exploit has two possible impacts. First, it may create new files in
the user's home directory. Second, and far more serious, it may overwrite
existing files that the user has write permissions to. A possible hacker with
some knowledge of a user's home directory might be able to destroy
important files stored within.
Disable the telnet URI handler from within Opera.
All Opera users are encouraged to upgrade to the latest version of the
# emerge sync
# emerge -pv ">=net-www/opera-7.50_beta1"
# emerge ">=net-www/opera-7.50_beta1"
Network Security Threat Level: Medium
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2005 Michel Arboi
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