Thomson Reuters leaked at least 3TB of sensitive data – yes, open elasticsearch instances

The Cybernews research team found that Thomson Reuters left at least three of its databases accessible for anyone to look at. One of the open instances, the 3TB public-facing ElasticSearch database, contains a trove of sensitive, up-to-date information from across the company’s platforms. The company recognized the issue and fixed it immediately.

Thomson Reuters provides customers with products such as the business-to-business media tool Reuters Connect, legal research service and database Westlaw, the tax automation system ONESOURCE, online research suite of editorial and source materials Checkpoint, and other tools.

The size of the open database the team discovered corresponds with the company using ElasticSearch, a data storage favored by enterprises dealing with extensive, constantly updated volumes of data.

  • Media giant with $6.35 billion in revenue left at least three of its databases open
  • At least 3TB of sensitive data exposed including Thomson Reuters plaintext passwords to third-party servers
  • The data company collects is a treasure trove for threat actors, likely worth millions of dollars on underground criminal forums
  • The company has immediately fixed the issue, and started notifying their customers
  • Thomson Reuters downplayed the issue, saying it affects only a “small subset of Thomson Reuters Global Trade customers”
  • The dataset was open for several days – malicious bots are capable of discovering instances within mere hours
  • Threat actors could use the leak for attacks, from social engineering attacks to ransomware

The naming of ElasticSearch indices inside the Thomson Reuters server suggests that the open instance was used as a logging server to collect vast amounts of data gathered through user-client interaction. In other words, the company collected and exposed thousands of gigabytes of data that Cybernews researchers believe would be worth millions of dollars on underground criminal forums because of the potential access it could give to other systems.

Meanwhile, Thomson Reuters claims that out of three misconfigured servers the team informed the company about, two were designed to be publicly accessible. The third server was a non-production server meant for “application logs from the pre-production/implementation environment.”


For example, the open dataset held access credentials to third-party servers. The details were held in plaintext format, visible to anyone crawling through the open instance.


The team also found the open instance to contain login and password reset logs. While these don’t expose either old or new passwords, the logs show the account holder’s email address, and the exact time the password change query was sent can be seen.

Another piece of sensitive information includes SQL (structured query language) logs that show what information Thomson Reuters clients were looking for. The records also include what information the query brought back.

That includes documents with corporate and legal information about specific businesses or individuals. For instance, an employee of a company based in the US was looking for information about an organization in Russia using Thomson Reuters services, only to find out that its board members were under US sanctions over their role in the invasion of Ukraine.

The team has also discovered that the open database included an internal screening of other platforms such as YouTube, Thomson Reuters clients’ access logs, and connection strings to other databases. The exposure of connection strings is particularly dangerous because the company’s internal network elements are exposed, enabling threat actors’ lateral movement and pivoting through Reuter Thomson’s internal systems.


The team contacted Thomson Reuters upon discovering the leaking database, and the company took down the open instance immediately.

“Upon notification we immediately investigated the findings provided by Cybernews regarding the three potentially misconfigured servers,” a Thomson Reuters representative told Cybernews.


Source: Thomson Reuters leaked at least 3TB of sensitive data | Cybernews

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