ID CVE-2017-12635
Summary Due to differences in the Erlang-based JSON parser and JavaScript-based JSON parser, it is possible in Apache CouchDB before 1.7.0 and 2.x before 2.1.1 to submit _users documents with duplicate keys for 'roles' used for access control within the database, including the special case '_admin' role, that denotes administrative users. In combination with CVE-2017-12636 (Remote Code Execution), this can be used to give non-admin users access to arbitrary shell commands on the server as the database system user. The JSON parser differences result in behaviour that if two 'roles' keys are available in the JSON, the second one will be used for authorising the document write, but the first 'roles' key is used for subsequent authorization for the newly created user. By design, users can not assign themselves roles. The vulnerability allows non-admin users to give themselves admin privileges.
References
Vulnerable Configurations
  • Apache Software Foundation CouchDB 0.8.0
    cpe:2.3:a:apache:couchdb:0.8.0
  • Apache Software Foundation CouchDB 0.8.1
    cpe:2.3:a:apache:couchdb:0.8.1
  • Apache Software Foundation CouchDB 0.9.0
    cpe:2.3:a:apache:couchdb:0.9.0
  • Apache Software Foundation CouchDB 0.9.1
    cpe:2.3:a:apache:couchdb:0.9.1
  • Apache Software Foundation CouchDB 0.9.2
    cpe:2.3:a:apache:couchdb:0.9.2
  • Apache Software Foundation CouchDB 0.10.0
    cpe:2.3:a:apache:couchdb:0.10.0
  • Apache Software Foundation CouchDB 0.10.1
    cpe:2.3:a:apache:couchdb:0.10.1
  • Apache Software Foundation CouchDB 0.10.2
    cpe:2.3:a:apache:couchdb:0.10.2
  • Apache Software Foundation CouchDB 0.11.0
    cpe:2.3:a:apache:couchdb:0.11.0
  • Apache Software Foundation CouchDB 0.11.1
    cpe:2.3:a:apache:couchdb:0.11.1
  • Apache Software Foundation CouchDB 0.11.2
    cpe:2.3:a:apache:couchdb:0.11.2
  • Apache Software Foundation CouchDB 1.0.0
    cpe:2.3:a:apache:couchdb:1.0.0
  • Apache Software Foundation CouchDB 1.0.1
    cpe:2.3:a:apache:couchdb:1.0.1
  • Apache Software Foundation CouchDB 1.0.2
    cpe:2.3:a:apache:couchdb:1.0.2
  • Apache Software Foundation CouchDB 1.0.3
    cpe:2.3:a:apache:couchdb:1.0.3
  • Apache Software Foundation CouchDB 1.0.4
    cpe:2.3:a:apache:couchdb:1.0.4
  • Apache Software Foundation CouchDB 1.1.0
    cpe:2.3:a:apache:couchdb:1.1.0
  • Apache Software Foundation CouchDB 1.1.1
    cpe:2.3:a:apache:couchdb:1.1.1
  • Apache Software Foundation CouchDB 1.1.2
    cpe:2.3:a:apache:couchdb:1.1.2
  • Apache Software Foundation CouchDB 1.2.0
    cpe:2.3:a:apache:couchdb:1.2.0
  • Apache Software Foundation CouchDB 1.2.1
    cpe:2.3:a:apache:couchdb:1.2.1
  • Apache Software Foundation CouchDB 1.2.2
    cpe:2.3:a:apache:couchdb:1.2.2
  • Apache Software Foundation CouchDB 1.3.0
    cpe:2.3:a:apache:couchdb:1.3.0
  • Apache Software Foundation CouchDB 1.3.1
    cpe:2.3:a:apache:couchdb:1.3.1
  • Apache Software Foundation CouchDB 1.4.0
    cpe:2.3:a:apache:couchdb:1.4.0
  • Apache Software Foundation CouchDB 1.5.0
    cpe:2.3:a:apache:couchdb:1.5.0
  • Apache Software Foundation CouchDB 1.5.1
    cpe:2.3:a:apache:couchdb:1.5.1
  • Apache Software Foundation CouchDB 1.6.0
    cpe:2.3:a:apache:couchdb:1.6.0
  • Apache Software Foundation CouchDB 1.6.1
    cpe:2.3:a:apache:couchdb:1.6.1
  • Apache Software Foundation CouchDB 2.0.0
    cpe:2.3:a:apache:couchdb:2.0.0
  • Apache Software Foundation CouchDB 2.0.0 Release Candidate 1
    cpe:2.3:a:apache:couchdb:2.0.0:rc1
  • Apache Software Foundation CouchDB 2.0.0 Release Candidate 2
    cpe:2.3:a:apache:couchdb:2.0.0:rc2
  • Apache Software Foundation CouchDB 2.0.0 Release Candidate 3
    cpe:2.3:a:apache:couchdb:2.0.0:rc3
  • Apache Software Foundation CouchDB 2.0.0 Release Candidate 4
    cpe:2.3:a:apache:couchdb:2.0.0:rc4
CVSS
Base: 10.0
Impact:
Exploitability:
CWE CWE-269
CAPEC
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
exploit-db via4
  • description Apache CouchDB 1.7.0 and 2.x before 2.1.1 - Remote Privilege Escalation. CVE-2017-12635. Webapps exploit for Linux platform
    file exploits/linux/webapps/44498.py
    id EDB-ID:44498
    last seen 2018-05-24
    modified 2018-04-23
    platform linux
    port
    published 2018-04-23
    reporter Exploit-DB
    source https://www.exploit-db.com/download/44498/
    title Apache CouchDB 1.7.0 and 2.x before 2.1.1 - Remote Privilege Escalation
    type webapps
  • description Apache CouchDB - Arbitrary Command Execution (Metasploit). CVE-2017-12635,CVE-2017-12636. Remote exploit for Linux platform. Tags: Metasploit Framework (MSF)...
    file exploits/linux/remote/45019.rb
    id EDB-ID:45019
    last seen 2018-07-13
    modified 2018-07-13
    platform linux
    port 5984
    published 2018-07-13
    reporter Exploit-DB
    source https://www.exploit-db.com/download/45019/
    title Apache CouchDB - Arbitrary Command Execution (Metasploit)
    type remote
  • description Apache CouchDB < 2.1.0 - Remote Code Execution. CVE-2017-12636. Webapps exploit for Linux platform
    file exploits/linux/webapps/44913.py
    id EDB-ID:44913
    last seen 2018-06-20
    modified 2018-06-20
    platform linux
    port
    published 2018-06-20
    reporter Exploit-DB
    source https://www.exploit-db.com/download/44913/
    title Apache CouchDB < 2.1.0 - Remote Code Execution
    type webapps
metasploit via4
nessus via4
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2017-A20D92573B.NASL
    description - CouchDB ver. 1.7.1 - Fixed CVE-2017-12635 - Fixed CVE-2017-12636 - Switched to eunit for testing - Erlang 20 compatible Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-07-16
    plugin id 105943
    published 2018-01-15
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=105943
    title Fedora 27 : couchdb / erlang-jiffy (2017-a20d92573b)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201711-16.NASL
    description The remote host is affected by the vulnerability described in GLSA-201711-16 (CouchDB: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in CouchDB. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could execute arbitrary shell commands or escalate privileges. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2018-07-13
    plugin id 104697
    published 2017-11-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=104697
    title GLSA-201711-16 : CouchDB: Multiple vulnerabilities
  • NASL family FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_1E54D140849311E8A7950028F8D09152.NASL
    description Apache CouchDB PMC reports : Database Administrator could achieve privilege escalation to the account that CouchDB runs under, by abusing insufficient validation in the HTTP API, escaping security controls implemented in previous releases.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 111018
    published 2018-07-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111018
    title FreeBSD : couchdb -- multiple vulnerabilities (1e54d140-8493-11e8-a795-0028f8d09152)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DLA-1252.NASL
    description CVE-2017-12635 Prevent non-admin users to give themselves admin privileges. CVE-2017-12636 Blacklist some configuration options to prevent execution of arbitrary shell commands as the CouchDB user For Debian 7 'Wheezy', these problems have been fixed in version 1.2.0-5+deb7u1. We recommend that you upgrade your couchdb packages. NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-07-13
    plugin id 106208
    published 2018-01-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=106208
    title Debian DLA-1252-1 : couchdb security update
packetstorm via4
refmap via4
bid 101868
confirm https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbmu03935en_us
exploit-db
  • 44498
  • 45019
gentoo GLSA-201711-16
mlist
  • [debian-lts-announce] 20180121 [SECURITY] [DLA 1252-1] couchdb security update
  • [dev] 20171114 Apache CouchDB CVE-2017-12635 and CVE-2017-12636
Last major update 14-11-2017 - 15:29
Published 14-11-2017 - 15:29
Last modified 02-10-2019 - 20:03
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