CVE-2018-0733

MEDIUM

OpenSSL 1.1.0-1.1.0g - Authentication Bypass via PA-RISC CRYPTO_memcmp Bit Comparison

Title source: llm
STIX 2.1

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).

References (14)

Core 14
Core References
Third Party Advisory x_refsource_confirm
https://www.tenable.com/security/tns-2018-04
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/201811-21
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/103517
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20180330-0002/
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040576
Vendor Advisory x_refsource_confirm
https://www.openssl.org/news/secadv/20180327.txt
Third Party Advisory x_refsource_confirm
https://www.tenable.com/security/tns-2018-07
Third Party Advisory x_refsource_confirm
https://www.tenable.com/security/tns-2018-06

Scores

CVSS v3 5.9
EPSS 0.0223
EPSS Percentile 84.8%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

Status published
Products (1)
openssl/openssl 1.1.0 - 1.1.0g
Published Mar 27, 2018
Tracked Since Feb 18, 2026