Ubuntu Manpage: perl5303delta - what is new for perl v5.30.3

Provided by: perl-doc_5.38.2-3.2ubuntu0.1_all

NAME

       perl5303delta - what is new for perl v5.30.3

DESCRIPTION

       This document describes differences between the 5.30.2 release and the 5.30.3 release.

       If you are upgrading from an earlier release such as 5.30.1, first read perl5302delta, which describes
       differences between 5.30.1 and 5.30.2.

Security

[CVE-2020-10543] Buffer overflow caused by a crafted regular expression
A signed "size_t" integer overflow in the storage space calculations for nested regular expression
quantifiers could cause a heap buffer overflow in Perl's regular expression compiler that overwrites
memory allocated after the regular expression storage space with attacker supplied data.

The target system needs a sufficient amount of memory to allocate partial expansions of the nested
quantifiers prior to the overflow occurring. This requirement is unlikely to be met on 64-bit systems.

Discovered by: ManhND of The Tarantula Team, VinCSS (a member of Vingroup).

[CVE-2020-10878] Integer overflow via malformed bytecode produced by a crafted regular expression
Integer overflows in the calculation of offsets between instructions for the regular expression engine
could cause corruption of the intermediate language state of a compiled regular expression. An attacker
could abuse this behaviour to insert instructions into the compiled form of a Perl regular expression.

Discovered by: Hugo van der Sanden and Slaven Rezic.

[CVE-2020-12723] Buffer overflow caused by a crafted regular expression
Recursive calls to S_study_chunk() by Perl's regular expression compiler to optimize the intermediate
language representation of a regular expression could cause corruption of the intermediate language state
of a compiled regular expression.

Discovered by: Sergey Aleynikov.

Additional Note
An application written in Perl would only be vulnerable to any of the above flaws if it evaluates regular
expressions supplied by the attacker. Evaluating regular expressions in this fashion is known to be
dangerous since the regular expression engine does not protect against denial of service attacks in this
usage scenario.

Incompatible Changes

       There are no changes intentionally incompatible with Perl 5.30.2.  If any exist, they are bugs, and we
       request that you submit a report.  See "Reporting Bugs" below.

Modules and Pragmata

   Updated Modules and Pragmata
       •   Module::CoreList has been upgraded from version 5.20200314 to 5.20200601_30.

Testing

       Tests were added and changed to reflect the other additions and changes in this release.

Acknowledgements

       Perl 5.30.3 represents approximately 3 months of development since Perl 5.30.2 and contains approximately
       1,100 lines of changes across 42 files from 7 authors.

       Excluding  auto-generated  files,  documentation and release tools, there were approximately 350 lines of
       changes to 8 .pm, .t, .c and .h files.

       Perl continues to flourish into its fourth decade thanks to a vibrant community of users and  developers.
       The following people are known to have contributed the improvements that became Perl 5.30.3:

       Chris 'BinGOs' Williams, Hugo van der Sanden, John Lightsey, Karl Williamson, Nicolas R., Sawyer X, Steve
       Hay.

       The  list  above  is  almost  certainly  incomplete as it is automatically generated from version control
       history.  In particular, it does not include the names of the (very much  appreciated)  contributors  who
       reported issues to the Perl bug tracker.

       Many  of  the  changes  included  in this version originated in the CPAN modules included in Perl's core.
       We're grateful to the entire CPAN community for helping Perl to flourish.

       For a more complete list of all of Perl's historical contributors, please see the  AUTHORS  file  in  the
       Perl source distribution.

Reporting Bugs

       If   you   find   what   you   think   is   a   bug,   you   might   check   the  perl  bug  database  at
       <https://github.com/Perl/perl5/issues>.  There may also be information  at  <https://www.perl.org/>,  the
       Perl Home Page.

       If     you     believe     you    have    an    unreported    bug,    please    open    an    issue    at
       <https://github.com/Perl/perl5/issues>.  Be sure to trim your bug down to  a  tiny  but  sufficient  test
       case.

       If  the  bug  you are reporting has security implications which make it inappropriate to send to a public
       issue tracker, then see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for  details  of  how  to
       report the issue.

Give Thanks

       If  you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by running the
       "perlthanks" program:

           perlthanks

       This will send an email to the Perl 5 Porters list with your show of thanks.