Vulnerability Details : CVE-2017-8819
In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, the replay-cache protection mechanism is ineffective for v2 onion services, aka TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue.
Products affected by CVE-2017-8819
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:tor_project:tor:*:*:*:*:*:*:*:*
- cpe:2.3:a:tor_project:tor:*:*:*:*:*:*:*:*
- cpe:2.3:a:tor_project:tor:*:*:*:*:*:*:*:*
- cpe:2.3:a:tor_project:tor:*:*:*:*:*:*:*:*
- cpe:2.3:a:tor_project:tor:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-8819
0.55%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 65 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-8819
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
References for CVE-2017-8819
-
https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
New stable Tor releases, with security fixes: 0.3.1.9, 0.3.0.13, 0.2.9.14, 0.2.8.17, 0.2.5.16 | Tor BlogVendor Advisory
-
https://www.debian.org/security/2017/dsa-4054
Debian -- Security Information -- DSA-4054-1 torThird Party Advisory
-
https://bugs.torproject.org/24244
#24244 (Fix TROVE-2017-009: Replay-cache ineffective for v2 hidden services.) – Tor Bug Tracker & WikiVendor Advisory
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