The impact of the vulnerability released today is expected to be much larger, given it includes the exact timestamp of every single 16-character tor domain visited. The previous vulnerability merely related to the last time a device had used Tor. Sick has previously reported a vulnerability to the Brave project – – which received a CVSS of 5.5. They should be seeing something like this: If you are affected you should be able to see all v2 domain access logs at full connection time (server connection).Visit while using Tor Private Browsing on the Brave Browser.You can read more about Tor’s v2 deprecation timeline here: Ī Brave user can check if they are affected by this vulnerability by doing the below: Tor will release a new client in October 2021 that will disable v2 domains. So the tor project made v3 domains now a whopping 56 characters long.” “V2 tor domain only 16 characters but companies like Facebook can brute force vanity URLs such as Facebook’s facebookcoreThis is a massive security risk because generating the same vanity URL can perform all kinds of attacks given that the tor network is distributed. Sick Codes explained to Privacy Affairs during a phone interview that he also notified Tor of this issue, but Tor did not consider this a major problem. The Brave browser versions 1.27 and below logged these events in the ~/.config/BraveSoftware/Brave-Browser/tor/data/tor.log file.īecause the Brave log timestamps coincide with the server connection time (when the warning is displayed), an attacker could determine the user’s identity if physical access to a device is obtained. Users receive warnings when accessing a new v2 domain, even during the same browsing session. Beginning June 2021, the Tor browser started warning users about this change whenever they accessed a v2 domain. In September 2020, Tor announced that it would deprecate v2 onion addresses. Brave users must update the browser as soon as possible if they use its built-in Tor Connectivity feature and still run v. This vulnerability affected any Brave version, including and below v. They will then be able to correlate the Brave timestamps, and the server logs and determine that the raided user was indeed the one accessing the website. onion site secretly run by the government, who will then raid the suspected user and compare Brave log files with server logs. For more information see Ī classic example would be when a journalist in an authoritarian country accesses a whistleblower v2. Please encourage the site operator to upgrade. These addresses are deprecated for security reasons, and are no longer supported in Tor. Jul 01 08:40:51.000 Warning! You've just connected to a v2 onion address. Jul 01 08:40:50.000 Warning! You've just connected to a v2 onion address. This data can then be compared with server connection logs obtained from a compromised Tor endpoint, or the attacker may have been the party controlling the server (i.e., honeypot).Ī log file would contain something like this: This can help the attacker establish when the user is connected to a new v2. This is obtained by reading the ~/.config/BraveSoftware/Brave-Browser/tor/data/tor.log file, where Brave saves this data. The discovered vulnerability can allow an attacker who obtains physical access to a device to view the exact timestamps that someone connected to a v2 onion address. The case was filed under CVE-2021-22929 and has been addressed and patched by Brave on August 16 2021. Cybersecurity researcher Sick.Codes has discovered a major vulnerability on Brave browser 1.27 and below where the browser permanently logs the server connection time for all v2 tor domains to ~/.config/BraveSoftware/Brave-Browser/tor/data/tor.log.
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