Vulnerability Details : CVE-2017-8821
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, an attacker can cause a denial of service (application hang) via crafted PEM input that signifies a public key requiring a password, which triggers an attempt by the OpenSSL library to ask the user for the password, aka TROVE-2017-011.
Vulnerability category: OverflowDenial of service
Exploit prediction scoring system (EPSS) score for CVE-2017-8821
Probability of exploitation activity in the next 30 days: 0.26%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 63 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2017-8821
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
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 |
CWE ids for CVE-2017-8821
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The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-8821
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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
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https://www.debian.org/security/2017/dsa-4054
Debian -- Security Information -- DSA-4054-1 torThird Party Advisory
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https://bugs.torproject.org/24246
#24246 (Fix TROVE-2017-011: An attacker can make tor ask for a password) – Tor Bug Tracker & WikiVendor Advisory
Products affected by CVE-2017-8821
- 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:*:*:*:*:*:*:*:*