diff options
| -rw-r--r-- | changelog.d/10468.misc | 1 | ||||
| -rw-r--r-- | synapse/rest/media/v1/download_resource.py | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/changelog.d/10468.misc b/changelog.d/10468.misc new file mode 100644 index 0000000000..b9854bb4c1 --- /dev/null +++ b/changelog.d/10468.misc @@ -0,0 +1 @@ +Mitigate media repo XSS attacks on IE11 via the non-standard X-Content-Security-Policy header. diff --git a/synapse/rest/media/v1/download_resource.py b/synapse/rest/media/v1/download_resource.py index cd2468f9c5..d6d938953e 100644 --- a/synapse/rest/media/v1/download_resource.py +++ b/synapse/rest/media/v1/download_resource.py @@ -49,6 +49,8 @@ class DownloadResource(DirectServeJsonResource): b" media-src 'self';" b" object-src 'self';", ) + # Limited non-standard form of CSP for IE11 + request.setHeader(b"X-Content-Security-Policy", b"sandbox;") request.setHeader( b"Referrer-Policy", b"no-referrer", |