Cryptographic issues in tor.eff Tor

1) Cryptographic issues

EUVDB-ID: #VU42144

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2013-7295

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Tor before 0.2.4.20, when OpenSSL 1.x is used in conjunction with a certain HardwareAccel setting on Intel Sandy Bridge and Ivy Bridge platforms, does not properly generate random numbers for (1) relay identity keys and (2) hidden-service identity keys, which might make it easier for remote attackers to bypass cryptographic protection mechanisms via unspecified vectors.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Tor: 0.2.4.1 - 0.2.4.18

CPE2.3

• cpe:2.3:a:tor_eff_org:tor:0.2.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.2.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.2.4.3:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-updates/2014-01/msg00095.html
https://lists.torproject.org/pipermail/tor-talk/2013-December/031483.html

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.