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Bug 1561260 - (CVE-2018-0733) CVE-2018-0733 openssl: Implementation bug in PA-RISC CRYPTO_memcmp function allows attackers to forge authenticated messages in a reduced number of attempts
CVE-2018-0733 openssl: Implementation bug in PA-RISC CRYPTO_memcmp function a...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180327,repor...
: Security
Depends On: 1561262 1561261 1561263
Blocks: 1561264
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Reported: 2018-03-27 21:02 EDT by Sam Fowler
Modified: 2018-09-26 20:33 EDT (History)
41 users (show)

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Fixed In Version: openssl 1.1.0h
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Last Closed: 2018-04-03 04:14:52 EDT
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 3399171 None None None 2018-04-04 01:23 EDT

  None (edit)
Description Sam Fowler 2018-03-27 21:02:43 EDT 
OpenSSL 1.1.0 has an implementation bug in the PA-RISC CRYPTO_memcmp function that effectively results 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.


External References:

https://www.openssl.org/news/secadv/20180327.txt


Upstream Patch:

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f
Comment 1 Sam Fowler 2018-03-27 21:03:27 EDT 
Created openssl tracking bugs for this issue:

Affects: fedora-all [bug 1561263]


Created mingw-openssl tracking bugs for this issue:

Affects: epel-7 [bug 1561262]
Comment 4 Huzaifa S. Sidhpurwala 2018-04-03 04:13:42 EDT 
Statement:

This flaw only affects the openssl code which is compiled by the HP-UX assembler, so that only HP-UX PA-RISC arches are affected. Red Hat Enterprise Linux does not support this architecture, and therefore is not affected.
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