Buffer overflow in Tor Project
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 class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.020 (80.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Tor Project
- Debian Linux — versions 8.0, 9.0
- Tor Before 0.2.5.16, 0.2.6 Through 0.2.8 0.2.8.17, 0.2.9 0.2.9.14, 0.3.0 0.3.0.13, And 0.3.1 0.3.1.9 — versions 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
Weakness classification (CWE)
Public proof-of-concept exploits
References
- blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-028… (Vendor Advisory)
- www.debian.org/security/2017/dsa-4054 (vendor-advisory, Third Party Advisory)
- bugs.torproject.org/24246 (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-8821?
- CVE-2017-8821 is a high-severity vulnerability in Tor Project, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2017-12-03.
- How severe is CVE-2017-8821?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2017-8821 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.