Use-after-free in tor.eff Tor
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-0491 |
| CWE-ID | CWE-416 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
Tor Client/Desktop applications / Web browsers |
| Vendor | tor.eff.org |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Use-after-free
EUVDB-ID: #VU31346
Risk: Medium
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2018-0491
CWE-ID:
CWE-416 - Use After Free
Exploit availability: Yes
DescriptionThe vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because the KIST implementation allows a channel to be added more than once in the pending list.
MitigationInstall update from vendor's website.
Vulnerable software versionsTor: 0.3.2.1 - 0.3.2.9
External linkshttp://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915
http://trac.torproject.org/projects/tor/ticket/24700
http://trac.torproject.org/projects/tor/ticket/25117
http://www.exploit-db.com/exploits/44994/
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. However, proof of concept for this vulnerability is available.
