AngularJS (EOL since 2022-01) and AngularJS Material no longer receive
security fixes, so any new vulnerability in them will stay unpatched.
In AngularJS, templates are code: any attacker-controlled text that
ends up in a compiled template is evaluated as an expression, and
since 1.6 there is no expression sandbox, so a single
{{constructor.constructor('...')()}} gives full script execution.
SOGo renders untrusted data (mail bodies, invitations, attachment
names, contact fields) into such templates and currently relies on
server-side filtering, like stripping "{{" and "}}", to prevent this.
Any gap in that filtering, or a bypass of $sanitize/ng-bind-html,
would mean XSS in the webmail session: reading and sending mail as
the user, and access to calendars and contacts.
A Content Security Policy adds a second layer in the browser that
doesn't depend on catching every injection. The new
SOGoContentSecurityPolicy system default ("report-only" or "enforce",
disabled when unset) sends a strict policy with the pages of the web
interface:
script-src 'self' 'nonce-<random>' (no 'unsafe-inline'/'unsafe-eval')
style-src 'self' 'unsafe-inline' (Angular Material, CKEditor 5)
object-src 'none'; base-uri 'self'; frame-ancestors 'self'; ...
The policy is generated by sogod, since a fresh 128-bit nonce is needed
per response: it is shared by all components of the response and set
on the inline configuration scripts of the page frame and module views.
The page also gets ng-csp="no-unsafe-eval", so AngularJS evaluates
expressions with its interpreter instead of Function().
With the policy enforced, an expression injected into a compiled
template, such as {{constructor.constructor('...')()}}, can no longer
reach Function() and fails with an EvalError, and injected inline
scripts are blocked. Injected expressions are limited to calling
functions available on the scope.
Tested with Chromium in both modes on login, Mail (HTML messages,
remote content, invitations, compose), Calendar and Contacts editors,
Preferences and Administration: no violations from SOGo's own code.
With the default unset, the generated output is unchanged.
form-action is deliberately not restricted, so SAML2/CAS/OpenID
logins posting to an external IdP keep working. Scripts listed in
SOGoUIAdditionalJSFiles are served from WebServerResources and allowed,
but must not load scripts from other origins, use eval() or rely on
inline handlers; their dependencies have to be installed and listed
alongside them.
Ensure the TOTP input field only accept number, so it is quicker to type on mobile devices.
Disable history of the TOTP input, which is not necessary.
See https://bugs.sogo.nu//view.php?id=5524
If you activate "Remember username" on the login screen the switch would have the same color as the background. This makes the active state of the switch not really visible.
This changes the theming of this switch to use the same color as the login button.
Jordi Mallach
Hivert Quentin
André Rodier
smizrahi
Marvin
Alex Vogt
Francis Lachapelle
olivierperes
Ludovic Marcotte
André Peters
Daniel Jagszent