Bug 1411238 – openssl switches to (SHA1, RSA) if no usable signature algorithm is specified

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Bug 1411238 - openssl switches to (SHA1, RSA) if no usable signature algorithm is specified

Summary:	openssl switches to (SHA1, RSA) if no usable signature algorithm is specified

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	openssl (Show other bugs)
Sub Component:
Version:	7.3
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Tomas Mraz
QA Contact:	Stefan Dordevic
Docs Contact:

URL:
Whiteboard:
Keywords:	Reopened

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2017-01-09 03:48 EST by Stanislav Zidek
Modified:	2017-08-01 14:16 EDT (History)
CC List:	1 user (show)

See Also:	1410573
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-08-01 14:16:10 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2017:1929	normal	SHIPPED_LIVE	openssl bug fix and enhancement update	2017-08-01 14:08:01 EDT

Groups: None (edit)

Description Stanislav Zidek 2017-01-09 03:48:42 EST

Description of problem:
If client sends only (MD5, RSA) in signature algorithms in ClientHello (or any other combination not supported by the server), it uses (SHA1, RSA) by default. This violates RFC 5246 (see bz1410573 for further details).

Version-Release number of selected component (if applicable):
openssl-1.0.1e-60.el7

How reproducible:
always

Steps to Reproduce:
1. start s_server
2. send ClientHello containing only (MD5, RSA) signature algorithm
3. look at signature algorithm used in ServerKeyExchange

Actual results:
(SHA1, RSA) is used

Expected results:
Connection is aborted.

Additional info:
This is already fixed in openssl-1.0.2j-1.fc24

Comment 2 Tomas Mraz 2017-04-03 10:34:41 EDT


*** This bug has been marked as a duplicate of bug 1276310 ***

Comment 6 errata-xmlrpc 2017-08-01 14:16:10 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1929

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