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.
the trailing while loop reuses the regex variable, which by then points at the
angular brace pattern whenever stripAngular is YES. that pattern has two
capture groups while the loop substitutes $1@im****$3, so NSRegularExpression
raises NSInvalidArgumentException and the NS_HANDLER swallows it.
give the @import pattern its own variable and use it in both the replacement
and the loop. the replacement also used the template of the block above, which
dropped the whole style element instead of masking the @import in place, so
test_stringWithoutHTMLInjection failed. it passes again, and a case with
stripAngular YES covers the loop.
fetching public ICS files without this patch result in continual opening
and closing of the "Localizable.strings" to create a NSDictionary,
looking up one key and closing it again. By caching it in a static
variable this greatly improves the performance.
Jordi Mallach
Hivert Quentin
smizrahi
Jan Kahmen
Emily Kooistra