Vulnerability identifier: #VU30429
Vulnerability 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:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Tor
Client/Desktop applications /
Web browsers
Vendor: tor.eff.org
Description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Tor: 0.2.5.1 - 0.2.5.10
External links
http://lists.torproject.org/pipermail/tor-talk/2015-March/037281.html
http://trac.torproject.org/projects/tor/ticket/14129
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.