seznam.cz: detection

[Ludvicek1]

Prerequisites

• [X] This is NOT a YouTube, Facebook, Twitch or a shortener/hosting site report. These sites MUST be reported by clicking their respective links.
• [X] I read and understand the policy about what is a valid filter issue.
• [X] I verified that this issue is not a duplicate. (Search here to find out.)
• [X] I did not remove any of the default filter lists, or I have verified that the issue was not caused by removing any of the default lists.
• [X] I did not enable additional filter lists, or I have verified that the issue still occurs without enabling additional filter lists.
• [X] I do not have custom filters/rules, or I have verified that the issue still occurs without custom filters/rules.
• [X] I am not using uBlock Origin along with other content blockers.
• [X] I have verified that the web browser's built-in content blocker/tracking protection, network wide/DNS blocking, or my VPN is not causing the issue.
• [X] I have verified that other extensions are not causing the issue.
• [X] If this is about a breakage or detection, I have verified that it is caused by uBlock Origin and isn't a site issue.
• [ ] I did not answer truthfully to ALL the above checkboxes.

URL(s) where the issue occurs.

seznam.cz
mapy.cz
cmp.seznam.cz

Description

"You may be using extensions or blockers that may be interfering with the loading of this page. To ensure proper functionality, please disable all these extensions and try to load the page again."

Other extensions used

none

Screenshot(s)

screenshot


Configuration

Details

```uBlock Origin: 1.57.2 Firefox: 124 filterset (summary): network: 131522 cosmetic: 46384 scriptlet: 19166 html: 1760 listset (total-discarded, last-updated): default: user-filters: 0-0, never ublock-filters: 37600-108, 21m ublock-badware: 8078-0, 21m ublock-privacy: 789-1, 21m ublock-unbreak: 2303-2, 21m ublock-quick-fixes: 122-24, 21m easylist: 84975-145, 22m easyprivacy: 50481-60, 22m urlhaus-1: 11580-5, 22m plowe-0: 3739-1162, 22m CZE-0: 833-10, 22m filterset (user): [empty] userSettings: [none] hiddenSettings: [none] supportStats: allReadyAfter: 1763 ms maxAssetCacheWait: 615 ms cacheBackend: indexedDB popupPanel: blocked: 2 network: seznam.cz: 2 extended: ##+js(no-setTimeout-if, 0x) ##+js(abort-on-property-write, Fisher) ##+js(addEventListener-defuser, message, fishing) ```

[mapx-]

• clear cookies / localStorage/ cache for the tested page
• reset uBO, don't modify any uBO setting, update all the filter lists, don't add any other list (other than your regional list)
• disable any custom filter for that site
• disable any other extension / addon in your browser, disable builtin blockers /shields/ tracking protection in brave/ opera/ vivaldi/ edge/ firefox etc
• disable (if any) the web shields in your antivirus / antimalware software / other blocking software
• are you using a DNS which features adblocking (like AdGuard DNS)?=> test using another DNS (google for example =>  IP addresses 8.8.8.8 & 8.8.4.4)
• restart the system, reopen the browser, test again.

[MIOGMIOG]

I have this issue too AND ON ALL OF MY MACHINES, here is log output of loading seznam.cz and then being redirected to the "disable adblock" webpage:

Logger output

``` +4 ||h.seznam.cz^ -- cmp.seznam.cz 1 get script https://h.seznam.cz/js/cmp2/scmp-cw.js ``` ``` +4 ##+js(addEventListener-defuser, message, fishing) cmp.seznam.cz get scriptlet https://cmp.seznam.cz/nastaveni-souhlasu?return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fcwreturn%3D1 ``` ``` +4 ##+js(abort-on-property-write, Fisher) cmp.seznam.cz get scriptlet https://cmp.seznam.cz/nastaveni-souhlasu?return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fcwreturn%3D1 ``` ``` +4 ##+js(no-setTimeout-if, 0x) cmp.seznam.cz get scriptlet https://cmp.seznam.cz/nastaveni-souhlasu?return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fcwreturn%3D1 ``` ``` +4 ||h.seznam.cz^ -- cmp.seznam.cz 1 get script https://h.seznam.cz/js/cmp2/scmp-cw.js ``` ``` +4 ||h.seznam.cz^ -- cmp.seznam.cz 1 get script https://h.seznam.cz/js/dot-small.js ``` ``` +4 behind-the-scene 0,3 get other https://www.seznam.cz/ ``` ``` +4 cmp.seznam.cz 1 get doc https://cmp.seznam.cz/nastaveni-souhlasu?return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fcwreturn%3D1 ``` ``` +4 https://cmp.seznam.cz/nastaveni-souhlasu?return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fcwreturn%3D1 ``` ``` +3 www.seznam.cz 1 get doc https://www.seznam.cz/?cwtoken=aGB9eXRtaGB9eXRtZGkwPj0-PDQ7Ojk4Pzg6ND8_OT0_OXF5MDw6PD4_Ojs0OjQjNTs-cXloMDw6PD4_Ojs0OjQjNTs-cW4wST47Pj5PPj1PO086TD9MOT08OThOOE8-PEk6PU48SUltPDo8Pj86OzQ6NCM8Og ``` ``` +3 https://www.seznam.cz/?cwtoken=aGB9eXRtaGB9eXRtZGkwPj0-PDQ7Ojk4Pzg6ND8_OT0_OXF5MDw6PD4_Ojs0OjQjNTs-cXloMDw6PD4_Ojs0OjQjNTs-cW4wST47Pj5PPj1PO086TD9MOT08OThOOE8-PEk6PU48SUltPDo8Pj86OzQ6NCM8Og ``` ``` +3 behind-the-scene 0,3 get other https://seznam.cz/ ``` ``` +3 behind-the-scene 0,3 get other http://seznam.cz/ ``` ``` +3 bcr.iva.seznam.cz 1 get doc https://bcr.iva.seznam.cz/?cwtoken=ZXl5fX43IiJ6enojfmh3Y2xgI253Im1oYH15dG08Ojw-Pzo7NDo0Izw6 ``` ``` +3 https://bcr.iva.seznam.cz/?cwtoken=ZXl5fX43IiJ6enojfmh3Y2xgI253Im1oYH15dG08Ojw-Pzo7NDo0Izw6 ``` ``` +2 www.seznam.cz 1 get doc https://www.seznam.cz/ ``` ``` +2 https://www.seznam.cz/ ``` ``` +2 www.seznam.cz 1 get doc https://www.seznam.cz/?noredirect=1 ``` ``` +2 https://www.seznam.cz/?noredirect=1 ``` ``` +1 login.szn.cz 1 get doc https://login.szn.cz/api/v1/autologin?service=homepage&return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fnoredirect%3D1 ``` ``` +1 https://login.szn.cz/api/v1/autologin?service=homepage&return_url=https%3A%2F%2Fwww.seznam.cz%2F%3Fnoredirect%3D1 ``` ``` +1 www.seznam.cz 1 get doc https://www.seznam.cz/ ``` ``` +1 https://www.seznam.cz/ ``` ``` +0 seznam.cz 1 get doc https://seznam.cz/ ``` ``` +0 https://seznam.cz/ ``` ``` +0 seznam.cz 1 get doc http://seznam.cz/ ``` ``` +0 http://seznam.cz/ ```

[MIOGMIOG]

Also there is even news article about this advertising company implementing this annoying anti-adblock, not sure if I can link it here, but u can find it by just googling "seznam.cz anti-adblock"(, also I think that this github issue may appear there in the future too lol)

[mapx-]

go into logger and tell me from what filter list did you get this filter: ||h.seznam.cz^

Do I need to be logged in to get such detection ?

[gwarser]

Dan Pollocks?

[mapx-]

Dan Pollocks?

right, but still no detection on my side

[MIOGMIOG]

go into logger and tell me from what filter list did you get this filter: ||h.seznam.cz^

Do I need to be logged in to get such detection ?

Unblocking that domain fixed it, that domain is showing the "do you want to be tracked or buy a subscription" agreement popup But I still think that someone should develop some bypass to this if possible

[mapx-]

add to "my filters"

||h.seznam.cz^$badfilter

Do I need to be logged in to get such detection ?

[ToIgnore]

is a set-cookie fix possible for the cookie notice?

[mapx-]

without reproducing the issue nothing we can do (only killing that filter)

[ToIgnore]

there is a cookie agreement => cmp.seznam.cz from seznam.cz

i can't get the clicker to work though

[MIOGMIOG]

add to "my filters"

||h.seznam.cz^$badfilter

Do I need to be logged in to get such detection ?

I can confirm that this (maybe temporary, who knows?) fix works great and there are no problems even if you are logged in Part of this issue that websites didn't work is now entirely fixed.