KL-001-2024-009: Journyx Reflected Cross Site Scripting<\/p>\n
Title: Journyx Reflected Cross Site Scripting
Advisory ID: KL-001-2024-009
Publication Date: 2024.08.07
Publication URL: https:\/\/korelogic.com\/Resources\/Advisories\/KL-001-2024-009.txt<\/p>\n
1. Vulnerability Details<\/p>\n
Affected Vendor: Journyx
Affected Product: Journyx (jtime)
Affected Version: 11.5.4
Platform: GNU\/Linux
CWE Classification: CWE-81: Improper Neutralization of Script in an Error
Message Web Page
CVE ID: CVE-2024-6892<\/p>\n
2. Vulnerability Description<\/p>\n
Attackers can craft a malicious link that once clicked
will execute arbitrary JavaScript in the context of
the Journyx web application.<\/p>\n
3. Technical Description<\/p>\n
During the active directory login flow, if an error
occurs, the user is redirected to a page containing
an error message outlining the problem. The error
message shown in the page response is derived from
the “error_description” query parameter that appears
in the URL. This parameter is not sanitized or validated
prior to being reflected, allowing for an attacker to
insert malicious HTML\/JavaScript into the “error_description”
parameter.<\/p>\n
This vulnerability can be exploited regardless of whether
active directory authentication has been configured for the
Journyx instance.<\/p>\n
4. Mitigation and Remediation Recommendation<\/p>\n
The vendor reports that this issue was remediated in Journyx
v13.0.0.<\/p>\n
For self-hosted instances of JournyX, additional security
measures (such as input sanitization) can be added by monkey
patching the PYC file responsible for handling request
parameters (mycgi.pyc).<\/p>\n
1) Rename “mycgi.pyc” to an alternative name, e.g. mycgi_original.pyc.
$ mv wt_tar\/pi\/pylib\/wtlib\/mycgi.py wt_tar\/pi\/pylib\/wtlib\/mycgi_original.py<\/p>\n
2) Create a file named “mycgi.py” in the same directory.
$ touch wt_tar\/pi\/pylib\/wtlib\/mycgi.py<\/p>\n
3) Insert the following code into the newly created “mycgi.py”<\/p>\n
from mycgi_original import *
from html import escape<\/p>\n
def patch():
pdata = _parse()<\/p>\n
# force the value of “end_URL” to always be “wte”
if pdata.get(‘end_URL’): pdata[‘end_URL’] = [‘wte’]\n
# sanitize user-controlled error messages
for parameter in [‘error’, ‘error_description’]:
if not pdata.get(parameter): continue
pdata[parameter] = [escape(value) for value in pdata[parameter]]\n
return pdata<\/p>\n
_parse = parse
parse = patch<\/p>\n
Once these changes have been made, the JournyX native “mycgi.parse()”
function will be overwritten with the “patch()” function located in the
“mycgi.py” file. Relevant to this advisory, the patch provided above
will replace special characters with their respective HTML entity
representation for the “error” and “error_description” parameters. This
list of parameters can be extended as needed.<\/p>\n
Additionally, if SSO is not required, requests to \/jtcgi\/r\/adlogin\/sso
could be dropped without forwarding invoking FastCGI via a ModSecurity
rule like the one below:<\/p>\n
SecRule REQUEST_URI “@contains adlogin\/sso” “id:4,phase:2,deny,log,auditlog”<\/p>\n
5. Credit<\/p>\n
This vulnerability was discovered by Jaggar Henry of KoreLogic, Inc.<\/p>\n
6. Disclosure Timeline<\/p>\n
2024.01.31 – KoreLogic notifies Journyx support of the intention to
report vulnerabilities discovered in the licensed,
on-premises version of the product.
2024.01.31 – Journyx acknowledges receipt.
2024.02.02 – KoreLogic requests a meeting with Journyx support to share
vulnerability details.
2024.02.07 – KoreLogic reports vulnerability details to Journyx.
2024.02.09 – Journyx responds that this vulnerability has been remediated
in the cloud-hosted version of the product.
2024.02.21 – KoreLogic offers to test the cloud version to confirm
the fix; no response.
2024.07.01 – KoreLogic notifies Journyx of impending public disclosure.
2024.07.09 – Journyx confirms version number of the remediation.
2024.08.07 – KoreLogic public disclosure.<\/p>\n
7. Proof of Concept<\/p>\n
The following URL contains the “error_description”
parameter with a value of “%3Csvg%2fonload%3dprompt(%27KoreLogic%27)%3E”:<\/p>\n
http:\/\/redacted.com:8080\/jtcgi\/r\/adlogin\/sso?code=1337&state=foobar&id_token=zoinks&error_description=%3Csvg%2fonload%3dprompt(%27KoreLogic%27)%3E&error=error<\/p>\n
This value is automatically URL decoded to “<svg\/onload=prompt(‘KoreLogic’)>”
and reflected into the page response:<\/p>\n
<div class=”errorMessage”>
Unable to complete sign-on attempt. This is possibly a configuration error in the application registration
on the Identity Provider (IdP) side. The IdP server said:
<p>error <b><svg onload=”prompt(‘KoreLogic’)”><\/svg><\/b><\/p>
<\/div><\/p>\n
Once this link is clicked or visited in a browser, the
javascript function “prompt()” is executed, and a display
box is presented, thereby validating the execution of
arbitrary JavaScript.<\/p>\n
The contents of this advisory are copyright(c) 2024
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
http:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/<\/p>\n
KoreLogic, Inc. is a founder-owned and operated company with a
proven track record of providing security services to entities
ranging from Fortune 500 to small and mid-sized companies. We
are a highly skilled team of senior security consultants doing
by-hand security assessments for the most important networks in
the U.S. and around the world. We are also developers of various
tools and resources aimed at helping the security community.
https:\/\/www.korelogic.com\/about-korelogic.html<\/p>\n
Our public vulnerability disclosure policy is available at:
https:\/\/korelogic.com\/KoreLogic-Public-Vulnerability-Disclosure-Policy<\/p>\n","protected":false},"excerpt":{"rendered":"
KL-001-2024-009: Journyx Reflected Cross Site Scripting Title: Journyx Reflected Cross Site ScriptingAdvisory ID: KL-001-2024-009Publication Date: 2024.08.07Publication URL: https:\/\/korelogic.com\/Resources\/Advisories\/KL-001-2024-009.txt 1. Vulnerability Details Affected Vendor: JournyxAffected Product: Journyx (jtime)Affected Version: 11.5.4Platform: GNU\/LinuxCWE Classification: CWE-81: Improper Neutralization of Script in an ErrorMessage Web PageCVE ID: CVE-2024-6892 2. Vulnerability Description Attackers can craft a malicious link that once clickedwill …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-58708","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/58708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=58708"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/58708\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=58708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=58708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=58708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}