CVE-2020-10543

Publication date 1 June 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.]

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
perl	20.10 groovy	Not affected
	20.04 LTS focal	Fixed 5.30.0-9ubuntu0.2
	19.10 eoan	Ignored end of life
	18.04 LTS bionic	Fixed 5.26.1-6ubuntu0.5
	16.04 LTS xenial	Fixed 5.22.1-9ubuntu0.9
	14.04 LTS trusty	Fixed 5.18.2-2ubuntu1.7+esm3 Ubuntu Pro

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Notes

alexmurray

Affects 5.005 to 5.30.2

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
perl	Upstream: 897d1f7

Severity score breakdown

Parameter	Value
Base score	8.2 · High
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