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
EPSS: 0.143 (96.2th percentile) — read the EPSS interpretation.
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.
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 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
- openssl-security@openssl.org (mailing-list, x_refsource_BUGTRAQ, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- openssl-security@openssl.org (mailing-list, x_refsource_BUGTRAQ, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory, x_refsource_MISC)
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.