Data Breach

One million cracked Poshmark accounts being sold online

Login details of more than 36 million Poshmark accounts are available for sale in the cybercrime underground.

Earlier in August, Poshmark, a social commerce marketplace where people in the United States can buy and sell new or used clothing, shoes, and accessories, disclosed a data breach that took place in May 2018.

The company discovered unauthorized access to its servers, the intruders stole personal information of the users, including usernames, hashed passwords, first and last names, gender information, and city of residenc.

Now login details for customers of Poshmark are circulating in clear text online. Data breach platform Have I Been Pwned, revealed that login details of more than 36 million Poshmark customers were acquired by an unauthorized party.

“In mid-2018, social commerce marketplace Poshmark suffered a data breach that exposed 36M user accounts. The compromised data included email addresses, names, usernames, genders, locations and passwords stored as bcrypt hashes. The data was provided to HIBP by a source who requested it be attributed to “JimScott.Sec@protonmail.com”.” reported HIBP.

Jim Scott, the person who provided the Poshmark data to Have I Been Pwned, revealed that the information was available for sale on the dark web $750.

The data include email addresses, names, usernames, genders, locations and passwords stored as bcrypt hashes. 

When the company disclosed the incident on August 1, it revealed that the passwords were hashed using the bcrypt algorithm that is considered secure.

“We do not believe user passwords were compromised during this incident because we use one-way encrypted passwords salted uniquely per user, making it nearly impossible to use these passwords to access an account.” declared the company. 

Anyway, password hashed with the bcrypt algorithm can still be cracked, though, even if each string is scrambled with unique salt data.

Now Scott told BleepingComputer that a set of one million cracked Poshmark accounts is circulating online.

The price should be higher than the initial one because passwords have been decrypted and could be immediately used in credential stuffing attacks.

Users should change the passwords for affected accounts and for any other service that shares the same login credentials.

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Pierluigi Paganini

(SecurityAffairs – SORM, surveillance)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.

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