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Ubuntu Security Notice USN-4602-2
October 27, 2020

perl vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Perl.

Software Description:
- perl: Practical Extraction and Report Language

Details:

USN-4602-1 fixed several vulnerabilities in Perl. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.


Original advisory details:

 ManhND discovered that Perl incorrectly handled certain regular
 expressions. In environments where untrusted regular expressions are
 evaluated, a remote attacker could possibly use this issue to cause Perl to
 crash, resulting in a denial of service, or possibly execute arbitrary
 code. (CVE-2020-10543)

 Hugo van der Sanden and Slaven Rezic discovered that Perl incorrectly
 handled certain regular expressions. In environments where untrusted
 regular expressions are evaluated, a remote attacker could possibly use
 this issue to cause Perl to crash, resulting in a denial of service, or
 possibly execute arbitrary code. (CVE-2020-10878)

 Sergey Aleynikov discovered that Perl incorrectly handled certain regular
 expressions. In environments where untrusted regular expressions are
 evaluated, a remote attacker could possibly use this issue to cause Perl to
 crash, resulting in a denial of service, or possibly execute arbitrary
 code. (CVE-2020-12723)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
  perl                            5.18.2-2ubuntu1.7+esm3

Ubuntu 12.04 ESM:
  perl                            5.14.2-6ubuntu2.11

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4602-2
  https://usn.ubuntu.com/4602-1
  CVE-2020-10543, CVE-2020-10878, CVE-2020-12723