CVE-2021-34548
Tor Half-Closed Connection Stream Confusion
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access control for ending a stream.
Se ha detectado un problema en Tor versiones anteriores a 0.4.6.5, también se conoce como TROVE-2021-003. Un atacante puede falsificar las funciones RELAY_END o RELAY_RESOLVED para omitir el control de acceso previsto para terminar un flujo
Tor suffers from an issue where half-closed connection tracking ignores layer_hint and due to this, entry/middle relays can spoof RELAY_END cells on half-closed streams, which can lead to stream confusion between OP and exit.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-06-10 CVE Reserved
- 2021-06-14 CVE Published
- 2024-08-04 CVE Updated
- 2024-09-15 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-290: Authentication Bypass by Spoofing
CAPEC
References (4)
| URL | Tag | Source |
|---|---|---|
| http://packetstormsecurity.com/files/163510/Tor-Half-Closed-Connection-Stream-Confusion.html | Third Party Advisory |
|
| https://gitlab.torproject.org/tpo/core/tor/-/issues/40389 | Broken Link |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://blog.torproject.org/node/2041 | 2023-08-08 | |
| https://security.gentoo.org/glsa/202107-25 | 2023-08-08 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Torproject Search vendor "Torproject" | Tor Search vendor "Torproject" for product "Tor" | < 0.3.5.15 Search vendor "Torproject" for product "Tor" and version " < 0.3.5.15" | - |
Affected
| ||||||
| Torproject Search vendor "Torproject" | Tor Search vendor "Torproject" for product "Tor" | >= 0.4.0.0 < 0.4.4.9 Search vendor "Torproject" for product "Tor" and version " >= 0.4.0.0 < 0.4.4.9" | - |
Affected
| ||||||
| Torproject Search vendor "Torproject" | Tor Search vendor "Torproject" for product "Tor" | >= 0.4.5.0 < 0.4.5.9 Search vendor "Torproject" for product "Tor" and version " >= 0.4.5.0 < 0.4.5.9" | - |
Affected
| ||||||
| Torproject Search vendor "Torproject" | Tor Search vendor "Torproject" for product "Tor" | >= 0.4.6.0 < 0.4.6.5 Search vendor "Torproject" for product "Tor" and version " >= 0.4.6.0 < 0.4.6.5" | - |
Affected
| ||||||