From: Secunia Security Advisories (sec-advsecunia.com)
Date: Sat Dec 13 2003 - 06:49:47 CST

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TITLE:
Opera Browser Arbitrary File Deletion Vulnerability

SECUNIA ADVISORY ID:
SA10425

VERIFY ADVISORY:
http://www.secunia.com/advisories/10425/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
Opera 7.x

DESCRIPTION:
A vulnerability has been reported in Opera, which can be exploited by
malicious people to delete arbitrary files on a user's system.

The vulnerability is caused due to an input validation error during
the creation of a temporary file when a download dialog box is
displayed. The temporary file's name is based on the name of the
downloaded file, but inadequate sanitation of certain character
sequences in the name makes it possible to conduct a directory
traversal attack and thereby escape the temporary folder.

Example, which overwrites "calc.exe" on a user's system:
http://[malicious_website]/[path]/AAAAAAAAAA%5C..%5C..%5Ccalc.exe

Successful exploitation allows a malicious website to overwrite and
delete arbitrary files on a user's system with the user's
privileges.

The vulnerability affects 7.x versions for Windows prior to 7.23.

SOLUTION:
Update to version 7.23.

Run applications with least privilege to mitigate the impact of
exploitation. Users should not browse the Internet with
administrative privileges.

REPORTED BY / CREDITS:
imagine and nesumin, Operash.

ORIGINAL ADVISORY:
http://opera.rainyblue.org/adv/opera07-autodel-en.php

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