Vulnerability in OpenSSL
CVE-2019-1549
OpenSSL 1.1.1 introduced a rewritten random number generator (RNG). This was intended to include protection in the event of a fork() system call in order to ensure that the parent and child processes did not share the same RNG state. However this protection was not being used in the default case. A partial mitigation for this issue is that the output from a high precision timer is mixed into the RNG state so the likelihood of a parent and child process sharing state is significantly reduced. If an application already calls OPENSSL_init_crypto() explicitly using OPENSSL_INIT_ATFORK then this problem does not occur at all. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c).
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: 0.062 (93.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.062 · newest: 0.062 · change: 0.000
Affected products
- OpenSSL — versions Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c)
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- seclists.org/bugtraq/2019/Oct/1 (mailing-list)
- www.debian.org/security/2019/dsa-4539 (vendor-advisory)
- usn.ubuntu.com/4376-1/ (vendor-advisory)
- www.oracle.com/security-alerts/cpuapr2020.html
- www.oracle.com/security-alerts/cpujul2020.html
- www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- www.oracle.com/security-alerts/cpujan2020.html
- www.openssl.org/news/secadv/20190910.txt (Vendor Advisory)
Frequently asked questions
- What is CVE-2019-1549?
- CVE-2019-1549 is a medium-severity vulnerability in OpenSSL, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2019-09-10.
- How severe is CVE-2019-1549?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-1549 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.