Yahoo investigates password breaches
Web giant Yahoo has confirmed it is investigating a breach of its system which may have exposed 450,000 user IDs, according to BBC News.
US security firm Trustedsec said the attack appeared to have originated from servers connected to Yahoo Voices, a user-generated section of the site.
It said that hacking group D33DS had claimed to be behind the attack.
Hours after the attack came to light, Yahoo had not put a warning on its site.
In a statement Yahoo said: "We confirm that an older file from Yahoo Contributor Network... containing approximately 450,000 Yahoo and other company users' names and passwords was compromised yesterday.
"Of these, less than 5% of the Yahoo accounts had valid passwords. We are taking immediate action by fixing the vulnerability
that led to the disclosure of this data, changing the passwords of the affected Yahoo users and notifying the companies whose users accounts may have been compromised."
According to US security firm Trustedsec, the compromised passwords were associated with a variety of email addresses including those from yahoo.com, gmail.com and aol.com.
It said that hackers used a well-established technique known as SQL injection to extract the sensitive information from the database.
"The most alarming part of the entire story was the fact that the passwords were stored entirely unencrypted," the security firm said in its blog.
Initial analysis by another security firm Imperva suggested that the compromised database might have contained some private data as well including names, addresses including postcode, phone numbers and dates of birth.
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