Information disclosure in Tor

1) Information disclosure

EUVDB-ID: #VU71194

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-23589

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a logical error within the process_socks4_request() function in src/core/proto/proto_socks.c, which leaks DNS queries in case the "SafeSocks=1". A remote attacker can gain unauthorized access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Tor: 0.3.5.0 - 0.4.7.12

External links

http://gitlab.torproject.org/tpo/core/tor/-/commit/a282145b3634547ab84ccd959d0537c021ff7ffc
http://gitlab.torproject.org/tpo/core/tor/-/issues/40730
http://hackerone.com/bugs?subject=torproject&report_id=1784589

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.