CVE-2024-28175 (published 2024-03-13T21:16Z)

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Due to the improper URL protocols filtering of links specified in the `link.argocd.argoproj.io` annotations in the application summary component, an attacker can achieve cross-site scripting with elevated permissions. All unpatched versions of Argo CD starting with v1.0.0 are vulnerable to a cross-site scripting (XSS) bug allowing a malicious user to inject a javascript: link in the UI. When clicked by a victim user, the script will execute with the victim's permissions (up to and including admin). This vulnerability allows an attacker to perform arbitrary actions on behalf of the victim via the API, such as creating, modifying, and deleting Kubernetes resources. A patch for this vulnerability has been released in Argo CD versions v2.10.3 v2.9.8, and v2.8.12. There are no completely-safe workarounds besides upgrading. The safest alternative, if upgrading is not possible, would be to create a Kubernetes admission controller to reject any resources with an annotation starting with link.argocd.argoproj.io or reject the resource if the value use an improper URL protocol. This validation will need to be applied in all clusters managed by ArgoCD.\n\n


Weakness information:
cwe_id: NVD-CWE-noinfo
cwe_name: Insufficient Information
description: There is insufficient information about the issue to classify it; details are unkown or unspecified.
extended_description: Insufficient Information

Fix information:
repo_url: https://github.com/argoproj/argo-cd
commit_details: repo_url: https://github.com/argoproj/argo-cd
author: RyotaK
author_date: 2024-03-14 03:26:47+09:00
msg: Merge pull request from GHSA-jwv5-8mqv-g387

* fix: Validate external URLs for applicatins

Signed-off-by: Ry0taK <49341894+Ry0taK@users.noreply.github.com>

* fix(ui): remove invalid external-link

Signed-off-by: Alexandre Gaudreault <alexandre_gaudreault@intuit.com>

* linting

Signed-off-by: Alexandre Gaudreault <alexandre_gaudreault@intuit.com>

---------

Signed-off-by: Ry0taK <49341894+Ry0taK@users.noreply.github.com>
Signed-off-by: Alexandre Gaudreault <alexandre_gaudreault@intuit.com>
Co-authored-by: Alexandre Gaudreault <alexandre_gaudreault@intuit.com>
repository: repo_url: https://github.com/argoproj/argo-cd
repo_name: argoproj/argo-cd
description: Declarative Continuous Deployment for Kubernetes
repo_language: Go
owner: argoproj
file_changes: filename: application-summary.tsx
change_type: ModificationType.MODIFY
diff: @@ -30,6 +30,7 @@ import {EditAnnotations} from './edit-annotations';
 
 import './application-summary.scss';
 import {DeepLinks} from '../../../shared/components/deep-links';
+import {ExternalLinks} from '../application-urls';
 
 function swap(array: any[], a: number, b: number) {
     array = array.slice();
@@ -341,20 +342,19 @@ export const ApplicationSummary = (props: ApplicationSummaryProps) => {
             )
         }
     ];
-
-    const urls = app.status.summary.externalURLs || [];
+    const urls = ExternalLinks(app.status.summary.externalURLs);
     if (urls.length > 0) {
         attributes.push({
             title: 'URLs',
             view: (
                 <React.Fragment>
-                    {urls
-                        .map(item => item.split('|'))
-                        .map((parts, i) => (
-                            <a key={i} href={parts.length > 1 ? parts[1] : parts[0]} target='__blank'>
-                                {parts[0]} &nbsp;
+                    {urls.map((url, i) => {
+                        return (
+                            <a key={i} href={url.ref} target='__blank'>
+                                {url.title} &nbsp;
                             </a>
-                        ))}
+                        );
+                    })}
                 </React.Fragment>
             )
         });

programming_language: TypeScript
filename: application-urls.test.ts
change_type: ModificationType.MODIFY
diff: @@ -1,4 +1,4 @@
-import {ExternalLink, InvalidExternalLinkError} from './application-urls';
+import { ExternalLink, ExternalLinks, InvalidExternalLinkError } from './application-urls';
 
 test('rejects malicious URLs', () => {
     expect(() => {
@@ -7,6 +7,16 @@ test('rejects malicious URLs', () => {
     expect(() => {
         const _ = new ExternalLink('data:text/html;<h1>hi</h1>');
     }).toThrowError(InvalidExternalLinkError);
+    expect(() => {
+        const _ = new ExternalLink('title|data:text/html;<h1>hi</h1>');
+    }).toThrowError(InvalidExternalLinkError);
+    expect(() => {
+        const _ = new ExternalLink('data:title|data:text/html;<h1>hi</h1>');
+    }).toThrowError(InvalidExternalLinkError);
+
+    expect(() => {
+        const _ = new ExternalLink('data:title|https://localhost:8080/applications');
+    }).not.toThrowError(InvalidExternalLinkError);
 });
 
 test('allows absolute URLs', () => {
@@ -18,3 +28,59 @@ test('allows relative URLs', () => {
     window.location = new URL('https://localhost:8080/applications');
     expect(new ExternalLink('/applications').ref).toEqual('/applications');
 });
+
+
+test('URLs format', () => {
+    expect(new ExternalLink('https://localhost:8080/applications')).toEqual({
+        ref: 'https://localhost:8080/applications',
+        title: 'https://localhost:8080/applications',
+    })
+    expect(new ExternalLink('title|https://localhost:8080/applications')).toEqual({
+        ref: 'https://localhost:8080/applications',
+        title: 'title',
+    })
+});
+
+
+test('malicious URLs from list to be removed', () => {
+    const urls: string[] = [
+        'javascript:alert("hi")',
+        'https://localhost:8080/applications',
+    ]
+    const links = ExternalLinks(urls);
+
+    expect(links).toHaveLength(1);
+    expect(links).toContainEqual({
+        ref: 'https://localhost:8080/applications',
+        title: 'https://localhost:8080/applications',
+    });
+});
+
+
+test('list to be sorted', () => {
+    const urls: string[] = [
+        'https://a',
+        'https://b',
+        'a|https://c',
+        'z|https://c',
+        'x|https://d',
+        'x|https://c',
+    ]
+    const links = ExternalLinks(urls);
+
+    // 'a|https://c',
+    // 'x|https://c',
+    // 'x|https://d',
+    // 'z|https://c',
+    // 'https://a',
+    // 'https://b',
+    expect(links).toHaveLength(6);
+    expect(links[0].title).toEqual('a')
+    expect(links[1].title).toEqual('x')
+    expect(links[1].ref).toEqual('https://c')
+    expect(links[2].title).toEqual('x')
+    expect(links[2].ref).toEqual('https://d')
+    expect(links[3].title).toEqual('z')
+    expect(links[4].title).toEqual('https://a')
+    expect(links[5].title).toEqual('https://b')
+});

programming_language: TypeScript
filename: application-urls.tsx
change_type: ModificationType.MODIFY
diff: @@ -29,7 +29,7 @@ export class ExternalLink {
     }
 }
 
-export const ApplicationURLs = ({urls}: {urls: string[]}) => {
+export const ExternalLinks = (urls?: string[]) => {
     const externalLinks: ExternalLink[] = [];
     for (const url of urls || []) {
         try {
@@ -42,16 +42,26 @@ export const ApplicationURLs = ({urls}: {urls: string[]}) => {
 
     // sorted alphabetically & links with titles first
     externalLinks.sort((a, b) => {
-        if (a.title !== '' && b.title !== '') {
+        const hasTitle = (x: ExternalLink): boolean => {
+            return x.title !== x.ref && x.title !== '';
+        };
+
+        if (hasTitle(a) && hasTitle(b) && a.title !== b.title) {
             return a.title > b.title ? 1 : -1;
-        } else if (a.title === '') {
+        } else if (hasTitle(b) && !hasTitle(a)) {
             return 1;
-        } else if (b.title === '') {
+        } else if (hasTitle(a) && !hasTitle(b)) {
             return -1;
         }
         return a.ref > b.ref ? 1 : -1;
     });
 
+    return externalLinks;
+};
+
+export const ApplicationURLs = ({urls}: {urls: string[]}) => {
+    const externalLinks: ExternalLink[] = ExternalLinks(urls);
+
     return (
         ((externalLinks || []).length > 0 && (
             <div className='applications-list__external-links-icon-container'>

programming_language: TypeScript