In haml versions prior to version 5.0.0.beta.2, when using user input to perform tasks on the server, characters like < > " '
must be escaped properly. In this case, the '
character was missed. An attacker can manipulate the input to introduce additional attributes, potentially executing code.
github.com/haml/haml
github.com/haml/haml/commit/18576ae6e9bdcb4303fdbe6b3199869d289d67c2
github.com/rubysec/ruby-advisory-db/blob/master/gems/haml/CVE-2017-1002201.yml
lists.debian.org/debian-lts-announce/2019/11/msg00007.html
lists.debian.org/debian-lts-announce/2021/12/msg00028.html
nvd.nist.gov/vuln/detail/CVE-2017-1002201
security.gentoo.org/glsa/202007-27
snyk.io/vuln/SNYK-RUBY-HAML-20362