RHSA-2021:1266MediumCVSS 8.6

Red Hat Security Advisory: perl security update

Published
April 20, 2021
Last Modified
October 14, 2026

🔗 CVE IDs covered (3)

CVE-2020-10543 →CVE-2020-10878 →CVE-2020-12723 →

📋 Description

CVE-2020-10543 — perl: heap-based buffer overflow in regular expression compiler leads to DoS CVE-2020-10878 — perl: corruption of intermediate language state of compiled regular expression due to integer overflow leads to DoS CVE-2020-12723 — perl: corruption of intermediate language state of compiled regular expression due to recursive S_study_chunk() calls leads to DoS

🎯 Affected products87

  • Red Hat Enterprise Linux Server AUS (v. 7.4)
  • Red Hat Enterprise Linux Server E4S (v. 7.4)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4)
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.4)
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.4)
  • Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.ppc64le as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.src as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.src as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.src as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.x86_64 as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-4:5.16.3-292.el7_4.2.x86_64 as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-CPAN-0:1.9800-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-CPAN-0:1.9800-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-CPAN-0:1.9800-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-ExtUtils-CBuilder-1:0.28.2.6-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-ExtUtils-CBuilder-1:0.28.2.6-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-ExtUtils-CBuilder-1:0.28.2.6-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-ExtUtils-Embed-0:1.30-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-ExtUtils-Embed-0:1.30-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-ExtUtils-Embed-0:1.30-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-ExtUtils-Install-0:1.58-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-ExtUtils-Install-0:1.58-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-ExtUtils-Install-0:1.58-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-IO-Zlib-1:1.10-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-IO-Zlib-1:1.10-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • perl-IO-Zlib-1:1.10-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server TUS (v. 7.4)
  • perl-Locale-Maketext-Simple-1:0.21-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • perl-Locale-Maketext-Simple-1:0.21-292.el7_4.2.noarch as a component of Red Hat Enterprise Linux Server E4S (v. 7.4)
  • +57 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.

🔗 References (7)