Buffer overflow in tor.eff Tor

1) Buffer overflow

EUVDB-ID: #VU31385

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-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

CPE2.3

• cpe:2.3:a:tor_eff_org:tor:0.2.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.2.8.2:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.2.8.3:*:*:*:*:*:*:*

External links

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