Debian: DSA-3501-1: perl security update

    Date 01 Mar 2016
    195
    Posted By LinuxSecurity Advisories
    Stephane Chazelas discovered a bug in the environment handling in Perl. Perl provides a Perl-space hash variable, %ENV, in which environment variables can be looked up. If a variable appears twice in envp, only the last value would appear in %ENV, but getenv would return the first.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3501-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    March 01, 2016                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : perl
    CVE ID         : CVE-2016-2381
    
    Stephane Chazelas discovered a bug in the environment handling in Perl.
    Perl provides a Perl-space hash variable, %ENV, in which environment
    variables can be looked up.  If a variable appears twice in envp, only
    the last value would appear in %ENV, but getenv would return the first.
    Perl's taint security mechanism would be applied to the value in %ENV,
    but not to the other rest of the environment.  This could result in an
    ambiguous environment causing environment variables to be propagated to
    subprocesses, despite the protections supposedly offered by taint
    checking.
    
    With this update Perl changes the behavior to match the following:
    
     a) %ENV is populated with the first environment variable, as getenv
        would return.
     b) Duplicate environment entries are removed.
    
    For the oldstable distribution (wheezy), this problem has been fixed
    in version 5.14.2-21+deb7u3.
    
    For the stable distribution (jessie), this problem has been fixed in
    version 5.20.2-3+deb8u4.
    
    For the unstable distribution (sid), this problem will be fixed in
    version 5.22.1-8.
    
    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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