Vulnerability in OpenSSL
CVE-2018-0739
Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.186 (97.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.189 · newest: 0.186 · change: -0.003
Affected products
- OpenSSL — versions Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n), Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g)
- Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10
- Debian Linux — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/3611-2/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2018/dsa-4158 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/201811-21 (vendor-advisory)
- access.redhat.com/errata/RHSA-2019:0367 (vendor-advisory)
- www.debian.org/security/2018/dsa-4157 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3505 (vendor-advisory)
- www.securityfocus.com/bid/103518 (VDB Entry, Third Party Advisory, vdb-entry)
- www.securitytracker.com/id/1040576 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2018:3221 (vendor-advisory)
- www.securityfocus.com/bid/105609 (vdb-entry)
Frequently asked questions
- What is CVE-2018-0739?
- CVE-2018-0739 is a medium-severity vulnerability in OpenSSL, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2018-03-27.
- How severe is CVE-2018-0739?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2018-0739 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.