Vulnerability identifier: #VU31386

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-8820

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tor
Client/Desktop applications / Web browsers

Vendor: tor.eff.org

Description

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

The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via a malformed descriptor, aka TROVE-2017-010.

Mitigation
Update to version 0.3.1.9.

Vulnerable software versions

Tor: 0.3.1 - 0.3.1.8

---

External links
http://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
http://bugs.torproject.org/24245
http://www.debian.org/security/2017/dsa-4054

---

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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