Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| P5-Encode Project | P5-Encode | >= 3.05, < 3.12 |
| Perl | Perl | <= 5.34.0 |
| Fedoraproject | Fedora | 34 |
Related Weaknesses (CWE)
References
- https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9PatchThird Party Advisory
- https://github.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d7PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://metacpan.org/dist/Encode/changesThird Party Advisory
- https://news.cpanel.com/unscheduled-tsr-10-august-2021/Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-36770Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210909-0003/Third Party Advisory
- https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9PatchThird Party Advisory
- https://github.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d7PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://metacpan.org/dist/Encode/changesThird Party Advisory
- https://news.cpanel.com/unscheduled-tsr-10-august-2021/Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-36770Third Party Advisory
FAQ
What is CVE-2021-36770?
CVE-2021-36770 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 l...
How severe is CVE-2021-36770?
CVE-2021-36770 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-36770?
Check the references section above for vendor advisories and patch information. Affected products include: P5-Encode Project P5-Encode, Perl Perl, Fedoraproject Fedora.