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CVE-2021-36770

Publication date 9 August 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

Encode.pm, as distributed in Perl through 5.34.0, allows local users to gain privileges via a Trojan horse Encode::ConfigLocal library (in the current working directory) that preempts dynamic module loading. Exploitation requires an unusual configuration, and certain 2021 versions of Encode.pm (3.05 through 3.11). This issue occurs because the || operator evaluates @INC in a scalar context, and thus @INC has only an integer value.

Read the notes from the security team

Status

Package Ubuntu Release Status
libencode-perl 24.10 oracular
Vulnerable
24.04 LTS noble
Vulnerable
23.10 mantic Ignored end of life, was needed
23.04 lunar Ignored end of life, was needed
22.10 kinetic Ignored end of life, was needed
22.04 LTS jammy
Vulnerable
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Not in release
perl 24.10 oracular
Fixed 5.32.1-3ubuntu3
24.04 LTS noble
Fixed 5.32.1-3ubuntu3
23.10 mantic
Fixed 5.32.1-3ubuntu3
23.04 lunar
Fixed 5.32.1-3ubuntu3
22.10 kinetic
Fixed 5.32.1-3ubuntu3
22.04 LTS jammy
Fixed 5.32.1-3ubuntu3
21.10 impish
Fixed 5.32.1-3ubuntu3
21.04 hirsute
Fixed 5.32.1-3ubuntu2.1
20.10 groovy Ignored end of life
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

Introduced by change in Encode 3.05 in perl 5.32 and 5.34.

Patch details

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

Package Patch details
perl

Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references