1=encoding utf8
2
3=head1 NAME
4
5perl5381delta - what is new for perl v5.38.1
6
7=head1 DESCRIPTION
8
9This document describes differences between the 5.38.0 release and the 5.38.1
10release.
11
12If you are upgrading from an earlier release such as 5.37.0, first read
13L<perl5380delta>, which describes differences between 5.37.0 and 5.38.0.
14
15=head1 Security
16
17This release fixes the following security issues. 
18
19=head2 CVE-2023-47038 - Write past buffer end via illegal user-defined Unicode property
20
21This vulnerability was reported directly to the Perl security team by
22Nathan Mills C<the.true.nathan.mills@gmail.com>.
23
24A crafted regular expression when compiled by perl 5.30.0 through
255.38.0 can cause a one-byte attacker controlled buffer overflow in a
26heap allocated buffer.
27
28=head2 CVE-2023-47039 - Perl for Windows binary hijacking vulnerability
29
30This vulnerability was reported to the Intel Product Security Incident
31Response Team (PSIRT) by GitHub user ycdxsb
32L<https://github.com/ycdxsb/WindowsPrivilegeEscalation>. PSIRT then
33reported it to the Perl security team.
34
35Perl for Windows relies on the system path environment variable to
36find the shell (C<cmd.exe>). When running an executable which uses
37Windows Perl interpreter, Perl attempts to find and execute C<cmd.exe>
38within the operating system. However, due to path search order issues,
39Perl initially looks for cmd.exe in the current working directory.
40
41An attacker with limited privileges can exploit this behavior by
42placing C<cmd.exe> in locations with weak permissions, such as
43C<C:\ProgramData>. By doing so, when an administrator attempts to use
44this executable from these compromised locations, arbitrary code can
45be executed.
46
47=head1 Acknowledgements
48
49Perl 5.38.1 represents approximately 5 months of development since Perl
505.38.0 and contains approximately 6,100 lines of changes across 34 files
51from 4 authors.
52
53Excluding auto-generated files, documentation and release tools, there were
54approximately 1,300 lines of changes to 9 .pm, .t, .c and .h files.
55
56Perl continues to flourish into its fourth decade thanks to a vibrant
57community of users and developers. The following people are known to have
58contributed the improvements that became Perl 5.38.1:
59
60Karl Williamson, Paul Evans, Steve Hay, Tony Cook.
61
62The list above is almost certainly incomplete as it is automatically
63generated from version control history. In particular, it does not include
64the names of the (very much appreciated) contributors who reported issues to
65the Perl bug tracker.
66
67Many of the changes included in this version originated in the CPAN modules
68included in Perl's core. We're grateful to the entire CPAN community for
69helping Perl to flourish.
70
71For a more complete list of all of Perl's historical contributors, please
72see the F<AUTHORS> file in the Perl source distribution.
73
74=head1 Reporting Bugs
75
76If you find what you think is a bug, you might check the perl bug database
77at L<https://github.com/Perl/perl5/issues>.  There may also be information at
78L<http://www.perl.org/>, the Perl Home Page.
79
80If you believe you have an unreported bug, please open an issue at
81L<https://github.com/Perl/perl5/issues>.  Be sure to trim your bug down to a
82tiny but sufficient test case.
83
84If the bug you are reporting has security implications which make it
85inappropriate to send to a public issue tracker, then see
86L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
87for details of how to report the issue.
88
89=head1 Give Thanks
90
91If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
92you can do so by running the C<perlthanks> program:
93
94    perlthanks
95
96This will send an email to the Perl 5 Porters list with your show of thanks.
97
98=head1 SEE ALSO
99
100The F<Changes> file for an explanation of how to view exhaustive details on
101what changed.
102
103The F<INSTALL> file for how to build Perl.
104
105The F<README> file for general stuff.
106
107The F<Artistic> and F<Copying> files for copyright information.
108
109=cut
110