The recommended way to install a Perl module is through the distribution's repositories, however, they can be installed manually with Perl. The recommended way to install a Perl module is through the distribution’s repositories, however, they can be installed manually with Perl. Linux on 2016-01-27 by Todd Partridge. Martin Prpič 2016-07-12 09:37:10 UTC The following issue was reported by Perl upstream: The problem relates to Perl 5 ('perl') loading modules from the includes directory array ('@INC') in which the last element is the current directory ('.' That means that, when 'perl' wants to load a module (during first compilation or during lazy loading of a module in run-time), perl will look for the module in the current directory at the end, since '.' Is the last include directory in its array of include directories to seek. The issue is with requiring libraries that are in '.' But are not otherwise installed. The major problem with this behavior is that it unexpectedly puts a user at risk whenever they execute any Perl scripts from a directory that is writable by other accounts on the system. For instance, if a user is logged in as root and changes directory into /tmp or an account's home directory, it is possible to now run any shell commands that are written in C, Python or Ruby without fear. The same isn't true for any shell commands that are written in Perl, since a significant proportion of Perl scripts will execute code in the current working directory whenever they are run. ![]() For example, if a user on a shared system creates the file /tmp/Pod/Perldoc/Toterm.pm, and then I log in as root, change directory to /tmp, and run 'perldoc perlrun', it will execute the code they have placed in the file. The most severe example discovered on Debian is that apt-get will load and execute the /tmp/Log/Agent.pm file regardless of the directory it is started from since it automatically changes directory to /tmp. This is present in perl versions 5.24 and below. We will be making additional maintenance releases of 5.24, 5.22 (current supported versions), and (as an exception, probably) 5.20 (which is no longer officially supported) which will include the fix for it. The fix, supplied in the attached patches, is to check if the last entry of @INC is '.' And if so, to remove it as an included path. Petr Pisar 2016-07-27 06:32:17 UTC Please note that the fix does not fix the real cause -- having '.' In Perl module search path list (@INC variable). It only patches every module bundled with upstream Perl (i.e. En Iso 1302 PDF - Booksread.org. 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Fundamentos de Administracion - Munch Galindo Este libro parte del hecho de que la administraci Libro ADMINISTRACION DE CAPITAL HUMANO: LA GESTION DEL ACTIVO MAS VALIOSO DE LA ORGANIZACION del Autor LOURDES MUNCH GALINDO por la Editorial TRILLAS Tema: Empresa Economia. Administracion de capital humano munch galindo, lourdes. [Lourdes Munch]. Administracion del capital humano/ Human Resources Administration: La gestion del activo mas valioso de la organizacion/ The Management of the Most Valuable Asset of the Organization. Core modules) that loads another module which is deemed not to be delivered within upstream Perl (i.e. Non-core modules). That is instead of not having '.' In the default interpreter @INC array (see last lines of 'perl -V' output), it changes some modules that do something like this: eval 'require $module'; in this manner: + local @INC = @INC; + pop @INC if $INC[-1] eq '.' ; eval 'require $module'; That has these consequences: (1) It does not fix any of the thousands of modules distributed from CPAN or another upstream. And many of them are delivered by Fedora. (2) Applying the patches to perl package in Fedora will keep vulnerable Fedora packages that supersede some Perl core modules (i.e. Dual-lived modules). Locale::Maketext module is delivered from perl-Locale-Maketext source package in Fedora. Not from perl source package. That means cloning this vulnerability to perl component is not enough. It should be cloned to perl-Locale-Maketext too. And probably to tens of other Fedora components. (3) It's possible that even plain 'require Foo::Bar;' code not in the eval argument possess the vulnerability in Fedora. Even if Foo::Bar were core module. That's because Foo::Bar module can be delivered by a binary package that is not required when installing package that does the 'require Foo::Bar;'. Either on purpose or as a packaging bug. While I consider this case as improbable (upstream worked very hard on the patches, Fedora tries to specify all dependencies between packages), I cannot exclude it. Fedora maintainers will deliver the upstream patches as part of new perl versions 5.22.3 and 5.24.1 in the beginning of August. Fedora maintainers will patch the dual-lived modules independently. Due to nature of this bug, Fedora maintainers are pondering removing the '.' Path from the default @INC globally on the perl interpreter level. At least in F26 and probably F25. And adding the '.' To the specific few modules that depends on it (inc::latest, inc::Module::Install). Tomas Hoger 2016-07-27 07:59:07 UTC (In reply to Petr Pisar from ) > Please note that the fix does not fix the real cause -- having '.' In Perl > module search path list (@INC variable). It only patches every module > bundled with upstream Perl (i.e. Core modules) that loads another module > which is deemed not to be delivered within upstream Perl (i.e.
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