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CVE-2020-10543

Published: 1 June 2020

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow. An application written in Perl would only be vulnerable to this flaw 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. Additionally, 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 64bit systems.]

Notes

AuthorNote
alexmurray
Affects 5.005 to 5.30.2

Priority

Low

Cvss 3 Severity Score

8.2

Score breakdown

Status

Package Release Status
perl
Launchpad, Ubuntu, Debian
bionic
Released (5.26.1-6ubuntu0.5)
eoan Ignored
(reached end-of-life)
focal
Released (5.30.0-9ubuntu0.2)
groovy Not vulnerable
(5.30.3-4)
precise
Released (5.14.2-6ubuntu2.11)
trusty
Released (5.18.2-2ubuntu1.7+esm3)
upstream
Released (5.28.3,5.30.3)
xenial
Released (5.22.1-9ubuntu0.9)
Patches:
upstream: https://github.com/perl/perl5/commit/897d1f7fd515b828e4b198d8b8bef76c6faf03ed

Severity score breakdown

Parameter Value
Base score 8.2
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H