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AUSCERT External Security Bulletin Redistribution
ESB-2022.2430
USN-5425-1: PCRE vulnerabilities
18 May 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: PCRE
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14155 CVE-2019-20838 CVE-2019-20454
Original Bulletin:
https://ubuntu.com/security/notices/USN-5425-1
Comment: CVSS (Max): 7.5 CVE-2019-20838 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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USN-5425-1: PCRE vulnerabilities
17 May 2022
Several security issues were fixed in PCRE.
Releases
o Ubuntu 22.04 LTS
o Ubuntu 21.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o pcre3 - Perl 5 Compatible Regular Expression Library
Details
Yunho Kim discovered that PCRE incorrectly handled memory when
handling certain regular expressions. An attacker could possibly use
this issue to cause applications using PCRE to expose sensitive
information. This issue only affects Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 21.10 and Ubuntu 22.04 LTS. ( CVE-2019-20838 )
It was discovered that PCRE incorrectly handled memory when
handling certain regular expressions. An attacker could possibly use
this issue to cause applications using PCRE to have unexpected
behavior. This issue only affects Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,
Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. ( CVE-2020-14155 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 22.04
o libpcre3 - 2:8.39-13ubuntu0.22.04.1
Ubuntu 21.10
o libpcre3 - 2:8.39-13ubuntu0.21.10.1
Ubuntu 20.04
o libpcre3 - 2:8.39-12ubuntu0.1
Ubuntu 18.04
o libpcre3 - 2:8.39-9ubuntu0.1
Ubuntu 16.04
o libpcre3 - 2:8.38-3.1ubuntu0.1~esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o libpcre3 - 1:8.31-2ubuntu2.3+esm1
Available with UA Infra or UA Desktop
After a standard system update you need to restart applications using PCRE,
such as the Apache HTTP server and Nginx, to make all the necessary
changes.
References
o CVE-2020-14155
o CVE-2019-20838
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