Integer overflow in OpenSSL
CVE-2019-1551
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.143 (96.5th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.143 · newest: 0.143 · change: 0.000
Affected products
- OpenSSL — versions Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d), Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t)
- Oracle Enterprise Manager Ops Center — versions 12.4.0.0
- Oracle MySQL Enterprise Monitor
- Oracle Peoplesoft Enterprise Peopletools — versions 8.56, 8.57, 8.58
- Tenable Log Correlation Engine
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 30, 31, 32
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- seclists.org/bugtraq/2019/Dec/39 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2019/dsa-4594 (vendor-advisory, Third Party Advisory)
- seclists.org/bugtraq/2019/Dec/46 (mailing-list, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html (vendor-advisory, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202004-10 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- usn.ubuntu.com/4376-1/ (vendor-advisory, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2020.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-1551?
- CVE-2019-1551 is a medium-severity vulnerability in OpenSSL, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2019-12-06.
- How severe is CVE-2019-1551?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-1551 known to be exploited?
- 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.