Bug 1837975 (CVE-2020-10543)
| Summary: | CVE-2020-10543 perl: heap-based buffer overflow in regular expression compiler leads to DoS | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | msiddiqu |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | caillon+fedoraproject, cwarfiel, ekirby, iarnell, jplesnik, kasal, kyoshida, mmaslano, perl-devel, perl-maint-list, ppisar, rhughes, sandmann, security-response-team, snavale, spotrh, tvainio |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | perl 5.30.3, perl 5.28.3 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-02-02 14:41:38 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1839272, 1839273, 1839274, 1844662, 1929869, 1933100, 1938328, 1972188, 1972189 | ||
| Bug Blocks: | 1838017 | ||
|
Description
msiddiqu
2020-05-20 10:15:58 UTC
Acknowledgments: Name: ManhND (Tarantula Team), VinCSS (Vingroup) (In reply to Todd Cullum from comment #4) > Mitigation: > > To mitigate this flaw, developers should not pass untrusted or uncontrolled > input data to the Perl regex engine for evaluation. That's not correct. The flaw requires passing an untrusted regular expression to the Perl regex compiler. The flaw does not depend on data (a subject text being) matched. And since the regular expressions in Perl can contain any arbitrary Perl code, supplying a user-provided regular expression has always been deemed a security risk. Mitigation: To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler. The flaw is in the calculation of minimum heap storage space in the routine S_study_chunk() of regcomp.c which allows a ssize_t overflow to occur, producing a subsequent heap buffer overflow and out-of-bounds write of attacker-specified data. References: https://github.com/Perl/perl5/compare/v5.30.2...v5.30.3 https://github.com/Perl/perl5/blob/blead/pod/perl5303delta.pod Created perl tracking bugs for this issue: Affects: fedora-all [bug 1844662] The fixes are now published in Perl versions 5.28.3 and 5.30.3. https://metacpan.org/pod/release/XSAWYERX/perl-5.28.3/pod/perldelta.pod https://metacpan.org/pod/release/XSAWYERX/perl-5.30.3/pod/perldelta.pod This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2021:0343 https://access.redhat.com/errata/RHSA-2021:0343 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-10543 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.6 Extended Update Support Via RHSA-2021:0883 https://access.redhat.com/errata/RHSA-2021:0883 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.7 Extended Update Support Via RHSA-2021:1032 https://access.redhat.com/errata/RHSA-2021:1032 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support Via RHSA-2021:1266 https://access.redhat.com/errata/RHSA-2021:1266 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1678 https://access.redhat.com/errata/RHSA-2021:1678 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.2 Extended Update Support Via RHSA-2021:2792 https://access.redhat.com/errata/RHSA-2021:2792 |