Bug 1576057 – CVE-2018-1129 ceph: cephx uses weak signatures

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Bug 1576057 - (CVE-2018-1129) CVE-2018-1129 ceph: cephx uses weak signatures

Summary:	CVE-2018-1129 ceph: cephx uses weak signatures

Status:	CLOSED ERRATA

Aliases:	CVE-2018-1129

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:	Aron Gunn

URL:
Whiteboard:	impact=moderate,public=20180709:1200,...
Keywords:	Security

Depends On:	1576438 1576439 1576440 1599405 1599408
Blocks:	1574281
	Show dependency tree / graph

Reported:	2018-05-08 12:56 EDT by Siddharth Sharma
Modified:	2018-10-15 18:04 EDT (History)
CC List:	18 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way signature calculation was handled by cephx authentication protocol. An attacker having access to ceph cluster network, who is able to alter the message payload, was able to bypass signature checks done by cephx protocol.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-07-30 01:15:25 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:2177	None	None	None	2018-07-11 14:11 EDT
Red Hat Product Errata	RHSA-2018:2179	None	None	None	2018-07-11 14:21 EDT
Red Hat Product Errata	RHSA-2018:2261	None	None	None	2018-07-26 14:06 EDT
Red Hat Product Errata	RHSA-2018:2274	None	None	None	2018-07-26 11:36 EDT

Groups: None (edit)

Description Siddharth Sharma 2018-05-08 12:56:30 EDT

A flaw was found in the way signature calculation is handled by cephx protocol. The signature calculation is encrypting a 29 byte struct with 16-byte block AES cipher, and then using the first 8 bytes of the result as signature. This only covers first (16 by tes) cipher block, data_crc falls on second block.There are no known exploits against this, If attacker can alter the message payload any changes in data_crc will not be noticed or checked by signature check.

Comment 3 Siddharth Sharma 2018-07-09 13:02:22 EDT

upstream fix:

http://tracker.ceph.com/issues/24837
https://github.com/ceph/ceph/commit/8f396cf35a3826044b089141667a196454c0a587

Comment 5 Siddharth Sharma 2018-07-09 13:08:54 EDT

Created ceph tracking bugs for this issue:

Affects: fedora-all [bug 1599408]

Comment 6 errata-xmlrpc 2018-07-11 14:10:54 EDT

This issue has been addressed in the following products:

  Red Hat Ceph Storage 3.0 for Ubuntu 16.04

Via RHSA-2018:2177 https://access.redhat.com/errata/RHSA-2018:2177

Comment 7 errata-xmlrpc 2018-07-11 14:21:11 EDT

This issue has been addressed in the following products:

  Red Hat Ceph Storage 3 for Red Hat Enterprise Linux 7

Via RHSA-2018:2179 https://access.redhat.com/errata/RHSA-2018:2179

Comment 10 errata-xmlrpc 2018-07-26 11:36:03 EDT

This issue has been addressed in the following products:

  Red Hat Ceph Storage 2 for Ubuntu 16.04

Via RHSA-2018:2274 https://access.redhat.com/errata/RHSA-2018:2274

Comment 11 errata-xmlrpc 2018-07-26 14:06:27 EDT

This issue has been addressed in the following products:

  Red Hat Ceph Storage 2 for Red Hat Enterprise Linux 7

Via RHSA-2018:2261 https://access.redhat.com/errata/RHSA-2018:2261

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