perl-5.30.3

[Bruce Dubbs]

New point version.

[Douglas R. Reno]

NAME

perldelta - 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.

Contains fixes for CVE-2020-10543, CVE-2020-10878, CVE-2020-12723

[Douglas R. Reno]

Fixed at r11895

[Bruce Dubbs]

Milestone renamed