[BreachExchange] One million cracked Poshmark accounts being sold online

Destry Winant destry at riskbasedsecurity.com
Wed Sep 4 10:15:59 EDT 2019


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

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 at protonmail.com”.” reported

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

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

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

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