5 perl5303delta - what is new for perl v5.30.3
9 This document describes differences between the 5.30.2 release and the 5.30.3
12 If you are upgrading from an earlier release such as 5.30.1, first read
13 L<perl5302delta>, which describes differences between 5.30.1 and 5.30.2.
17 =head2 [CVE-2020-10543] Buffer overflow caused by a crafted regular expression
19 A signed C<size_t> integer overflow in the storage space calculations for
20 nested regular expression quantifiers could cause a heap buffer overflow in
21 Perl's regular expression compiler that overwrites memory allocated after the
22 regular expression storage space with attacker supplied data.
24 The target system needs a sufficient amount of memory to allocate partial
25 expansions of the nested quantifiers prior to the overflow occurring. This
26 requirement is unlikely to be met on 64-bit systems.
28 Discovered by: ManhND of The Tarantula Team, VinCSS (a member of Vingroup).
30 =head2 [CVE-2020-10878] Integer overflow via malformed bytecode produced by a crafted regular expression
32 Integer overflows in the calculation of offsets between instructions for the
33 regular expression engine could cause corruption of the intermediate language
34 state of a compiled regular expression. An attacker could abuse this behaviour
35 to insert instructions into the compiled form of a Perl regular expression.
37 Discovered by: Hugo van der Sanden and Slaven Rezic.
39 =head2 [CVE-2020-12723] Buffer overflow caused by a crafted regular expression
41 Recursive calls to C<S_study_chunk()> by Perl's regular expression compiler to
42 optimize the intermediate language representation of a regular expression could
43 cause corruption of the intermediate language state of a compiled regular
46 Discovered by: Sergey Aleynikov.
48 =head2 Additional Note
50 An application written in Perl would only be vulnerable to any of the above
51 flaws if it evaluates regular expressions supplied by the attacker. Evaluating
52 regular expressions in this fashion is known to be dangerous since the regular
53 expression engine does not protect against denial of service attacks in this
56 =head1 Incompatible Changes
58 There are no changes intentionally incompatible with Perl 5.30.2. If any
59 exist, they are bugs, and we request that you submit a report. See
60 L</Reporting Bugs> below.
62 =head1 Modules and Pragmata
64 =head2 Updated Modules and Pragmata
70 L<Module::CoreList> has been upgraded from version 5.20200314 to 5.20200601_30.
76 Tests were added and changed to reflect the other additions and changes in this
79 =head1 Acknowledgements
81 Perl 5.30.3 represents approximately 3 months of development since Perl 5.30.2
82 and contains approximately 1,100 lines of changes across 42 files from 7
85 Excluding auto-generated files, documentation and release tools, there were
86 approximately 350 lines of changes to 8 .pm, .t, .c and .h files.
88 Perl continues to flourish into its fourth decade thanks to a vibrant community
89 of users and developers. The following people are known to have contributed
90 the improvements that became Perl 5.30.3:
92 Chris 'BinGOs' Williams, Hugo van der Sanden, John Lightsey, Karl Williamson,
93 Nicolas R., Sawyer X, Steve Hay.
95 The list above is almost certainly incomplete as it is automatically generated
96 from version control history. In particular, it does not include the names of
97 the (very much appreciated) contributors who reported issues to the Perl bug
100 Many of the changes included in this version originated in the CPAN modules
101 included in Perl's core. We're grateful to the entire CPAN community for
102 helping Perl to flourish.
104 For a more complete list of all of Perl's historical contributors, please see
105 the F<AUTHORS> file in the Perl source distribution.
107 =head1 Reporting Bugs
109 If you find what you think is a bug, you might check the perl bug database at
110 L<https://github.com/Perl/perl5/issues>. There may also be information at
111 L<https://www.perl.org/>, the Perl Home Page.
113 If you believe you have an unreported bug, please open an issue at
114 L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
115 tiny but sufficient test case.
117 If the bug you are reporting has security implications which make it
118 inappropriate to send to a public issue tracker, then see
119 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION> for details of how to
124 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you
125 can do so by running the C<perlthanks> program:
129 This will send an email to the Perl 5 Porters list with your show of thanks.
133 The F<Changes> file for an explanation of how to view exhaustive details on
136 The F<INSTALL> file for how to build Perl.
138 The F<README> file for general stuff.
140 The F<Artistic> and F<Copying> files for copyright information.