Debian: DSA-3628-1: perl security update

    Date25 Jul 2016
    CategoryDebian
    81
    Posted ByLinuxSecurity Advisories
    Multiple vulnerabilities were discovered in the implementation of the Perl programming language. The Common Vulnerabilities and Exposures project identifies the following problems:
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3628-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    July 25, 2016                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : perl
    CVE ID         : CVE-2016-1238 CVE-2016-6185
    Debian Bug     : 829578
    
    Multiple vulnerabilities were discovered in the implementation of the
    Perl programming language. The Common Vulnerabilities and Exposures
    project identifies the following problems:
    
    CVE-2016-1238
    
        John Lightsey and Todd Rinaldo reported that the opportunistic
        loading of optional modules can make many programs unintentionally
        load code from the current working directory (which might be changed
        to another directory without the user realising) and potentially
        leading to privilege escalation, as demonstrated in Debian with
        certain combinations of installed packages.
    
        The problem relates to 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.
    
        With this update several modules which are known to be vulnerable
        are updated to not load modules from current directory.
    
        Additionally the update allows configurable removal of "." from @INC
        in /etc/perl/sitecustomize.pl for a transitional period. It is
        recommended to enable this setting if the possible breakage for a
        specific site has been evaluated. Problems in packages provided in
        Debian resulting from the switch to the removal of '.' from @INC
        should be reported to the Perl maintainers at
        This email address is being protected from spambots. You need JavaScript enabled to view it. .
    
        It is planned to switch to the default removal of '.' in @INC in a
        subsequent update to perl via a point release if possible, and in
        any case for the upcoming stable release Debian 9 (stretch).
    
    CVE-2016-6185
    
        It was discovered that XSLoader, a core module from Perl to
        dynamically load C libraries into Perl code, could load shared
        library from incorrect location. XSLoader uses caller() information
        to locate the .so file to load. This can be incorrect if
        XSLoader::load() is called in a string eval. An attacker can take
        advantage of this flaw to execute arbitrary code.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 5.20.2-3+deb8u6. Additionally this update includes the
    following updated packages to address optional module loading
    vulnerabilities related to CVE-2016-1238, or to address build failures
    which occur when '.' is removed from @INC:
    
     - cdbs 0.4.130+deb8u1
     - debhelper 9.20150101+deb8u2
     - devscripts 2.15.3+deb8u1
     - exim4 4.84.2-2+deb8u1
     - libintl-perl 1.23-1+deb8u1
     - libmime-charset-perl 1.011.1-1+deb8u2
     - libmime-encwords-perl 1.014.3-1+deb8u1
     - libmodule-build-perl 0.421000-2+deb8u1
     - libnet-dns-perl 0.81-2+deb8u1
     - libsys-syslog-perl 0.33-1+deb8u1
     - libunicode-linebreak-perl 0.0.20140601-2+deb8u2
    
    We recommend that you upgrade your perl packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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