Denial of service in Tor

1) Resource management error

EUVDB-ID: #VU75732

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-33903

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources when processing wedging of RTT estimation. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Tor: 0.4.7.6 rc - 0.4.7.7

CPE2.3

• cpe:2.3:a:tor_eff_org:tor:0.4.7.6:rc:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.4.7.7:*:*:*:*:*:*:*

External links

https://security-tracker.debian.org/tracker/CVE-2022-33903
https://lists.torproject.org/pipermail/tor-announce/2022-June/000242.html
https://security.gentoo.org/glsa/202305-11

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.