Buffer overflow in tor.eff Tor

1) Buffer overflow

EUVDB-ID: #VU31385

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-2016-1254

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

Tor before 0.2.8.12 might allow remote attackers to cause a denial of service (client crash) via a crafted hidden service descriptor.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Tor: 0.2.8.1 - 0.2.8.11

External links

http://lists.opensuse.org/opensuse-updates/2016-12/msg00154.html
http://lists.opensuse.org/opensuse-updates/2016-12/msg00155.html
http://blog.torproject.org/blog/tor-02812-released
http://gitweb.torproject.org/tor.git/commit/?id=d978216dea6b21ac38230a59d172139185a68dbd
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FXOJSMCTIOHLBRYFBVEL3CDLGPZXX6WE/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GTU2R253477RZLYAJAR5DAXAON7KIVLA/
http://trac.torproject.org/projects/tor/ticket/21018
http://www.debian.org/security/2016/dsa-3741

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.