CVE-2018-0733

Incorrect CRYPTO_memcmp on HP-UX PA-RISC

Description

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).

5.9

CVSS

Severity: Medium

CVSS 3.0 •

CVSS 2.0 •

EPSS 1.96% Top 20%

Vendor Advisory gentoo.org Vendor Advisory openssl.org

Affected: OpenSSL OpenSSL

References

Link	Tags
https://www.tenable.com/security/tns-2018-07
https://www.tenable.com/security/tns-2018-04
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://security.gentoo.org/glsa/201811-21	vendor advisory
http://www.securityfocus.com/bid/103517	third party advisory vdb entry
https://www.tenable.com/security/tns-2018-06
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
https://security.netapp.com/advisory/ntap-20180330-0002/	third party advisory
http://www.securitytracker.com/id/1040576	third party advisory vdb entry
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f
https://www.openssl.org/news/secadv/20180327.txt	vendor advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

Frequently Asked Questions

What is the severity of CVE-2018-0733?: CVE-2018-0733 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0733?: To fix CVE-2018-0733, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-0733 being actively exploited in the wild?: It is possible that CVE-2018-0733 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0733?: CVE-2018-0733 affects OpenSSL OpenSSL.