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Vulnerability Details : CVE-2017-12635

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.
Publish Date : 2017-11-14 Last Update Date : 2019-10-03
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Execute Code
CWE ID 269

- Products Affected By CVE-2017-12635

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Couchdb * * * * Version Details Vulnerabilities
2 Application Apache Couchdb 2.0.0 RC3 * * Version Details Vulnerabilities
3 Application Apache Couchdb 2.0.0 RC4 * * Version Details Vulnerabilities
4 Application Apache Couchdb 2.0.0 * * * Version Details Vulnerabilities
5 Application Apache Couchdb 2.0.0 RC1 * * Version Details Vulnerabilities
6 Application Apache Couchdb 2.0.0 RC2 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Couchdb 6

- References For CVE-2017-12635 CONFIRM
GENTOO GLSA-201711-16
EXPLOIT-DB 45019[email protected]
MLIST [dev] 20171114 Apache CouchDB CVE-2017-12635 and CVE-2017-12636
MLIST [debian-lts-announce] 20180121 [SECURITY] [DLA 1252-1] couchdb security update
BID 101868 Apache CouchDB CVE-2017-12635 Remote Privilege Escalation Vulnerability Release Date:2017-11-27

- Metasploit Modules Related To CVE-2017-12635

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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