Resource management error in tor.eff Tor

1) Resource management error

EUVDB-ID: #VU43220

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-5573

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service (memory consumption or excessive cell reception rate) or bypass intended flow-control restrictions via a RELAY_COMMAND_SENDME command.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Tor: 0.0.2 - 0.2.3.23

CPE2.3

• cpe:2.3:a:tor_eff_org:tor:0.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:tor_eff_org:tor:0.0.4:*:*:*:*:*:*:*

External links

https://openwall.com/lists/oss-security/2012/11/26/11
https://secunia.com/advisories/51329
https://security.gentoo.org/glsa/glsa-201301-03.xml
https://bugs.gentoo.org/show_bug.cgi?id=444804
https://bugzilla.redhat.com/show_bug.cgi?id=880310
https://exchange.xforce.ibmcloud.com/vulnerabilities/80289
https://gitweb.torproject.org/arma/tor.git/commitdiff/b9b54568c0bb64c32bd0b362954bdbc8c1234b16
https://gitweb.torproject.org/tor.git/blob/release-0.2.3:/ReleaseNotes
https://trac.torproject.org/projects/tor/ticket/6252

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.