Firefox before 1.0.1 and Mozilla before 1.7.6 allows remote malicious web sites to overwrite arbitrary files by tricking the user into downloading a .LNK (link) file twice, which overwrites the file that was referenced in the first .LNK file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2005-0587
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100037
• http://secunia.com/advisories/19823
• http://www.mozilla.org/security/announce/mfsa2005-21.html
• http://www.novell.com/linux/security/advisories/2006_04_25.html
• http://www.securityfocus.com/bid/12659