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).
EPSS: 0.193 (97.1th percentile) — read the EPSS interpretation.
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.
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 Debian_linux — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- openssl-security@openssl.org (vendor-advisory, x_refsource_GENTOO)
- openssl-security@openssl.org (x_refsource_REDHAT, vendor-advisory)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- openssl-security@openssl.org (x_refsource_REDHAT, vendor-advisory)
- openssl-security@openssl.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- openssl-security@openssl.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
- openssl-security@openssl.org (x_refsource_REDHAT, vendor-advisory)
- openssl-security@openssl.org (vdb-entry, x_refsource_BID)
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.