Reflected XSS in handler_server_info

[mmmds]

Requested URL is improperly displayed on the About page. The problem occurs on default configuration in Cherokee and Cheroke administrator panel. XSS in administrator panel can be used to reconfigure the server and execute arbitrary commands.

PoC

http://127.0.0.1/about/"><script>alert(1)</script>
http://127.0.0.1:9090/about/"><script>alert(1)</script>

Setup:

• Ubuntu 18.04 64 bit
• source code from github, commit 9a75e65b876bcc376cb6b379dca1f7ce4a055c59
• build command:

  ac_cv_func_realloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes LDFLAGS="-lasan" LDADD="-lasan" CFLAGS="-fsanitize=address -ggdb -O0 -fprofile-arcs -ftest-coverage" ./configure --prefix=`pwd`/bin --enable-trace --enable-static-module=all --enable-static --enable-shared=no
  make

• files in webroot mkdir /var/www/test{1..20}; for i inseq 1 20; do echo test > test$i/test.html; done
• configuration file cherokee.txt

found by: Mateusz Kocielski, Michał Dardas from LogicalTrust

[skinkie]

@mmmds Thanks for doing the research on our code and reporting the issue. I have committed a patch and qa-test to our master branch.