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Family: Gentoo Local Security Checks --> Category: infos
[GLSA-200405-19] Opera telnet URI handler file creation/truncation vulnerability Vulnerability Scan
Vulnerability Scan Summary
Opera telnet URI handler file creation/truncation vulnerability
Detailed Explanation for this Vulnerability Test
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
following:
telnet://-nMyFile
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.
Impact
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.
Workaround
Disable the telnet URI handler from within Opera.
References:
http://www.idefense.com/application/poi/display?id=104&type=vulnerabilities&flashstatus=true
Solution:
All Opera users are encouraged to upgrade to the latest version of the
program:
# emerge sync
# emerge -pv ">=net-www/opera-7.50_beta1"
# emerge ">=net-www/opera-7.50_beta1"
Threat Level: Medium
Click HERE for more information and discussions on this network vulnerability scan.
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