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
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:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-8821
0.26%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 63 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-8821
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 |
CWE ids for CVE-2017-8821
-
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.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
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