/ 
perl-5.34.0-RC2
⭐ Starred 2013
/ Net::FTP::dataconn
Security Advisories (6)
CVE-2022-48522 (2023-08-22)

In Perl 5.34.0, function S_find_uninit_var in sv.c has a stack-based crash that can lead to remote code execution or local privilege escalation.

CVE-2023-47038 (2023-10-30)

A crafted regular expression when compiled by perl 5.30.0 through 5.38.0 can cause a one attacker controlled byte buffer overflow in a heap allocated buffer

CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

CVE-2024-56406 (2025-04-13)

A heap buffer overflow vulnerability was discovered in Perl. Release branches 5.34, 5.36, 5.38 and 5.40 are affected, including development versions from 5.33.1 through 5.41.10. When there are non-ASCII bytes in the left-hand-side of the `tr` operator, `S_do_trans_invmap` can overflow the destination pointer `d`.    $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;'    Segmentation fault (core dumped) It is believed that this vulnerability can enable Denial of Service and possibly Code Execution attacks on platforms that lack sufficient defenses.

CVE-2025-40909 (2025-05-30)

Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

NAME

Net::FTP::dataconn - FTP Client data connection class

SYNOPSIS

# Perform IO operations on an FTP client data connection object:

$num_bytes_read = $obj->read($buffer, $size);
$num_bytes_read = $obj->read($buffer, $size, $timeout);

$num_bytes_written = $obj->write($buffer, $size);
$num_bytes_written = $obj->write($buffer, $size, $timeout);

$num_bytes_read_so_far = $obj->bytes_read();

$obj->abort();

$closed_successfully = $obj->close();

DESCRIPTION

Some of the methods defined in Net::FTP return an object which will be derived from this class. The dataconn class itself is derived from the IO::Socket::INET class, so any normal IO operations can be performed. However the following methods are defined in the dataconn class and IO should be performed using these.

read($buffer, $size[, $timeout])

Read $size bytes of data from the server and place it into $buffer, also performing any <CRLF> translation necessary. $timeout is optional, if not given, the timeout value from the command connection will be used.

Returns the number of bytes read before any <CRLF> translation.

write($buffer, $size[, $timeout])

Write $size bytes of data from $buffer to the server, also performing any <CRLF> translation necessary. $timeout is optional, if not given, the timeout value from the command connection will be used.

Returns the number of bytes written before any <CRLF> translation.

bytes_read()

Returns the number of bytes read so far.

abort()

Abort the current data transfer.

close()

Close the data connection and get a response from the FTP server. Returns true if the connection was closed successfully and the first digit of the response from the server was a '2'.

EXPORTS

None.

KNOWN BUGS

None.

AUTHOR

Graham Barr <gbarr@pobox.com>.

Steve Hay <shay@cpan.org> is now maintaining libnet as of version 1.22_02.

COPYRIGHT

Copyright (C) 1997-2010 Graham Barr. All rights reserved.

Copyright (C) 2013-2014, 2020 Steve Hay. All rights reserved.

LICENCE

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself, i.e. under the terms of either the GNU General Public License or the Artistic License, as specified in the LICENCE file.

VERSION

Version 3.13

DATE

23 Dec 2020

HISTORY

See the Changes file.