PERL5303DELTA(1) Perl Programmers Reference Guide PERL5303DELTA(1) #

PERL5303DELTA(1) Perl Programmers Reference Guide PERL5303DELTA(1)

NNAAMMEE #

 perl5303delta - what is new for perl v5.30.3

DDEESSCCRRIIPPTTIIOONN #

 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.

SSeeccuurriittyy [[CCVVEE--22002200--1100554433]] BBuuffffeerr oovveerrffllooww ccaauusseedd bbyy aa ccrraafftteedd rreegguullaarr eexxpprreessssiioonn 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).

[[CCVVEE--22002200--1100887788]] IInntteeggeerr oovveerrffllooww vviiaa mmaallffoorrmmeedd bbyytteeccooddee pprroodduucceedd bbyy aa ccrraafftteedd rreegguullaarr eexxpprreessssiioonn 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.

[[CCVVEE--22002200--1122772233]] BBuuffffeerr oovveerrffllooww ccaauusseedd bbyy aa ccrraafftteedd rreegguullaarr eexxpprreessssiioonn 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.

AAddddiittiioonnaall NNoottee 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.

IInnccoommppaattiibbllee CChhaannggeess 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.

MMoodduulleess aanndd PPrraaggmmaattaa UUppddaatteedd MMoodduulleess aanndd PPrraaggmmaattaa • Module::CoreList has been upgraded from version 5.20200314 to 5.20200601_30.

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

AAcckknnoowwlleeddggeemmeennttss 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 _A_U_T_H_O_R_S file in the Perl source distribution.

RReeppoorrttiinngg BBuuggss 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.

GGiivvee TThhaannkkss 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.

SSEEEE AALLSSOO #

 The _C_h_a_n_g_e_s file for an explanation of how to view exhaustive details on
 what changed.

 The _I_N_S_T_A_L_L file for how to build Perl.

 The _R_E_A_D_M_E file for general stuff.

 The _A_r_t_i_s_t_i_c and _C_o_p_y_i_n_g files for copyright information.

perl v5.36.3 2021-03-01 PERL5303DELTA(1)