Use After Free in Tor Project
CVE-2017-8823
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, there is a use-after-free in onion service v2 during intro-point expiration because the expiring list is mismanaged in certain error cases, aka TROVE-2017-013.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · 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)
References
- bugs.torproject.org/24313 (Issue Tracking, Vendor Advisory)
- blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-028… (Vendor Advisory)
- bugs.torproject.org/24430 (Vendor Advisory)
- www.debian.org/security/2017/dsa-4054 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-8823?
- CVE-2017-8823 is a high-severity vulnerability in Tor Project, classified under Use After Free. CVSS score: 8.1/10. Published 2017-12-03.
- How severe is CVE-2017-8823?
- High severity. CVSS v3 base score is 8.1 out of 10.