Arch Linux Security Advisory ASA-201910-5 ========================================= Severity: Medium Date : 2019-10-02 CVE-ID : CVE-2012-6708 CVE-2015-9251 CVE-2019-15845 CVE-2019-16201 CVE-2019-16254 CVE-2019-16255 Package : ruby2.5 Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1040 Summary ======= The package ruby2.5 before version 2.5.7-1 is vulnerable to multiple issues including arbitrary code execution, content spoofing, cross-site scripting, denial of service and insufficient validation. Resolution ========== Upgrade to 2.5.7-1. # pacman -Syu "ruby2.5>=2.5.7-1" The problems have been fixed upstream in version 2.5.7. Workaround ========== None. Description =========== - CVE-2012-6708 (cross-site scripting) jQuery before 1.9.0 is vulnerable to Cross-site Scripting (XSS) attacks. The jQuery(strInput) function does not differentiate selectors from HTML in a reliable fashion. In vulnerable versions, jQuery determined whether the input was HTML by looking for the '<' character anywhere in the string, giving attackers more flexibility when attempting to construct a malicious payload. In fixed versions, jQuery only deems the input to be HTML if it explicitly starts with the '<' character, limiting exploitability only to attackers who can control the beginning of a string, which is far less common. - CVE-2015-9251 (cross-site scripting) jQuery before 3.0.0 is vulnerable to Cross-site Scripting (XSS) attacks when a cross-domain Ajax request is performed without the dataType option, causing text/javascript responses to be executed. - CVE-2019-15845 (insufficient validation) It has been discovered that Ruby before 2.4.8, 2.5.7 and 2.6.5 is vulnerable to NUL injection in built-in methods (File.fnmatch and File.fnmatch?). An attacker who has the control of the path pattern parameter could exploit this vulnerability to make path matching pass despite the intention of the program author. The Built-in methods File.fnmatch and its alias File.fnmatch? accept the path pattern as their first parameter. When the pattern contains NUL character (\0), the methods recognize that the path pattern ends immediately before the NUL byte. Therefore, a script that uses an external input as the pattern argument, an attacker can make it wrongly match a pathname that is the second parameter. - CVE-2019-16201 (denial of service) It has been discovered that Ruby before 2.4.8, 2.5.7 and 2.6.5 is vulnerable to denial of service via regular expressions in WEBrick's Digest access authentication module. An attacker can exploit this vulnerability to cause an effective denial of service against a WEBrick service. - CVE-2019-16254 (content spoofing) It has been discovered that Ruby before 2.4.8, 2.5.7 and 2.6.5 is vulnerable to HTTP response splitting in WEBrick bundled with Ruby. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. This is the same issue as CVE-2017-17742. The previous fix was incomplete, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF. - CVE-2019-16255 (arbitrary code execution) It has been discovered that Ruby before 2.4.8, 2.5.7 and 2.6.5 is vulnerable to code injection. Shell#[] and its alias Shell#test defined in lib/shell.rb allow code injection if the first argument (aka the “command” argument) is untrusted data. An attacker can exploit this to call an arbitrary Ruby method. Impact ====== A remote attacker is able to bypass path restrictions, perform a denial of service attack, inject malicious content or call an arbitrary Ruby method under certain circumstances. Furthermore, an attacker is able to perform cross-side scripting attacks by tricking users to generate documentation with a vulnerable RDoc version. RDoc is a static documentation generation tool, patching the tool itself is insufficient to mitigate these vulnerabilities. Documentations generated with previous versions have to be re-generated with newer RDoc. References ========== https://bugs.archlinux.org/task/63977 https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-5-7-released/ https://bugs.jquery.com/ticket/11290 https://github.com/jquery/jquery/commit/05531fc4080ae24070930d15ae0cea7ae056... https://github.com/jquery/jquery/issues/2432 https://github.com/jquery/jquery/commit/f60729f3903d17917dc351f3ac87794de379... https://www.ruby-lang.org/en/news/2019/10/01/nul-injection-file-fnmatch-cve-... https://www.ruby-lang.org/en/news/2019/10/01/webrick-regexp-digestauth-dos-c... https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webr... https://www.ruby-lang.org/en/news/2019/10/01/code-injection-shell-test-cve-2... https://security.archlinux.org/CVE-2012-6708 https://security.archlinux.org/CVE-2015-9251 https://security.archlinux.org/CVE-2019-15845 https://security.archlinux.org/CVE-2019-16201 https://security.archlinux.org/CVE-2019-16254 https://security.archlinux.org/CVE-2019-16255