Multiple vulnerabilities in Tor

Published: 2020-04-01

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-10592 CVE-2020-10593
CWE-ID	CWE-400 CWE-401
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Tor Client/Desktop applications / Web browsers
Vendor	tor.eff.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU26505

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10592

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to improper resource management. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Tor: 0.3.5.0 - 0.4.2.6

External links

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.html
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.html
http://security.gentoo.org/glsa/202003-50
http://trac.torproject.org/projects/tor/ticket/33120

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.

2) Memory leak

EUVDB-ID: #VU26506