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Synthesis of the vulnerability 
An attacker can trigger a memory corruption via sftk_FreeSession() of Mozilla NSS, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Fedora, WebSphere MQ, McAfee Web Gateway, Firefox, NSS, Solaris, RHEL, Ubuntu.
Severity of this alert: 3/4.
Creation date: 04/11/2019.
Références of this alert: 6403293, bulletinoct2020, CVE-2019-11756, FEDORA-2019-4175e7cb56, FEDORA-2019-8934d55352, FEDORA-2019-e4c45e113c, MFSA-2019-36, MFSA-2019-37, RHSA-2020:3280-01, RHSA-2020:4076-01, RHSA-2021:0758-01, RHSA-2021:0876-01, RHSA-2021:1026-01, USN-4216-1, VIGILANCE-VUL-30767.
Description of the vulnerability 
An attacker can trigger a memory corruption via sftk_FreeSession() of Mozilla NSS, in order to trigger a denial of service, and possibly to run code. Full bulletin, software filtering, emails, fixes, ... (Request your free trial)
This weakness bulletin impacts software or systems such as Fedora, WebSphere MQ, McAfee Web Gateway, Firefox, NSS, Solaris, RHEL, Ubuntu.
Our Vigil@nce team determined that the severity of this computer weakness is important.
The trust level is of type confirmed by the editor, with an origin of document.
An attacker with a expert ability can exploit this vulnerability announce.
Solutions for this threat 
Mozilla NSS: version 3.47.
The version 3.47 is fixed:
http://ftp.mozilla.org/pub/security/nss/releases/
Fedora: new nspr packages.
New packages are available:
Fedora 29: nspr 4.23.0-1.fc29
Fedora 30: nspr 4.23.0-1.fc30
Fedora 31: nspr 4.23.0-1.fc31
Fedora: new nss packages.
New packages are available:
Fedora 30: nss 3.47.0-2.fc30
Fedora 31: nss 3.47.0-2.fc31
Firefox: version 68.3.
The version 68.3 is fixed:
https://www.mozilla.org/en-US/firefox/new/
Firefox: version 71.
The version 71 is fixed:
https://www.mozilla.org/en-US/firefox/new/
IBM MQ Appliance: fixed versions for NSS/NSPR.
Fixed versions are indicated in information sources.
McAfee Web Gateway: version 8.2.15.
The version 8.2.15 is fixed:
https://www.mcafee.com/
McAfee Web Gateway: version 9.2.6.
The version 9.2.6 is fixed:
https://www.mcafee.com/
Oracle Solaris: patch for third party software of July 2020 v2.
A patch is available:
https://support.oracle.com/rs?type=doc&id=1448883.1
Oracle Solaris: patch for third party software of October 2020 v2.
A patch is available:
https://support.oracle.com/rs?type=doc&id=1448883.1
RHEL 7.4: new nss-softokn packages.
New packages are available:
RHEL 7.4: nss-softokn 3.28.3-10.el7_4
RHEL 7.6: new nss packages.
New packages are available:
RHEL 7.6: nss 3.36.0-9.el7_6
RHEL 7.7: new nss-softokn packages.
New packages are available:
RHEL 7.7: nss-softokn 3.44.0-9.el7_7
RHEL 7.9: new nss/nspr packages.
New packages are available:
RHEL 7.9: nspr 4.25.0-2.el7_9, nss 3.53.1-3.el7_9
RHEL 8.2: new nss/nspr packages.
New packages are available:
RHEL 8.2: nspr 4.25.0-2.el8_2, nss 3.53.1-11.el8_2
Ubuntu: new firefox packages.
New packages are available:
Ubuntu 19.10: firefox 71.0+build5-0ubuntu0.19.10.1
Ubuntu 19.04: firefox 71.0+build5-0ubuntu0.19.04.1
Ubuntu 18.04 LTS: firefox 71.0+build5-0ubuntu0.18.04.1
Wind River Linux: version 10.19.45.12.
The version 10.19.45.12 is fixed:
https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=24&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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