Vulnerability in Openssl
CVE-2018-0733
Because of an implementation bug the PA-RISC CRYPTO_memcmp function is effectively reduced to only comparing the least significant bit of each byte. This allows an attacker to forge messages that would be considered as authenticated in an amount of tries lower than that guaranteed by the security claims of the scheme. The module can only be compiled by the HP-UX assembler, so that only HP-UX PA-RISC targets are affected. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g).
EPSS: 0.086 (94.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Openssl — versions Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (vendor-advisory, x_refsource_GENTOO)
- openssl-security@openssl.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CONFIRM, Third Party Advisory)
- openssl-security@openssl.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
Frequently asked questions
- What is CVE-2018-0733?
- CVE-2018-0733 is a medium-severity vulnerability in Openssl. CVSS score: 5.9/10. Published 2018-03-27.
- How severe is CVE-2018-0733?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2018-0733 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.