CVE-2021-36770
Published: 9 August 2021
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | Introduced by change in Encode 3.05 in perl 5.32 and 5.34. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libencode-perl Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(2.96-1)
|
| focal |
Not vulnerable
(3.02-1)
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Needed
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Ignored
(end of life, was needed)
|
|
| mantic |
Needed
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
|
perl Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.26.1-6ubuntu0.5)
|
| focal |
Not vulnerable
(5.30.0-9ubuntu0.2)
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Released
(5.32.1-3ubuntu2.1)
|
|
| impish |
Released
(5.32.1-3ubuntu3)
|
|
| jammy |
Released
(5.32.1-3ubuntu3)
|
|
| kinetic |
Released
(5.32.1-3ubuntu3)
|
|
| lunar |
Released
(5.32.1-3ubuntu3)
|
|
| mantic |
Released
(5.32.1-3ubuntu3)
|
|
| trusty |
Not vulnerable
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
|
|
|
Patches: upstream: https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| 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 |