SB2017062922 - Session hijacking in Tor
Published: June 29, 2017 Updated: July 12, 2017
Security Bulletin ID
SB2017062922
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Session hijacking (CVE-ID: CVE-2017-0377)
CWE-ID: CWE-384 - Session Fixation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote unauthenticated user to hijack the target user's session.
The weakness exists due to guard-selection algorithm only considers the exit relay (not the exit relay's family). A remote attacker can leverage the existence of large families, defeat intended anonymity properties and steal the victim's session.
Remediation
Install update from vendor's website.