ELA-957-1 zabbix security update

multiple issues

Version1:2.2.23+dfsg-0+deb8u5 (jessie)
Related CVEs CVE-2013-7484 CVE-2019-17382 CVE-2022-43515 CVE-2023-29450 CVE-2023-29451 CVE-2023-29454 CVE-2023-29455 CVE-2023-29456 CVE-2023-29457

Several security vulnerabilities have been discovered in zabbix, a network monitoring solution, potentially allowing to crash the server, information disclosure or Cross-Site-Scripting attacks.

Important Notices: To mitigate CVE-2019-17382, on existing installations, the guest account needs to be manually disabled, for example by disabling the the “Guest group” in the UI: Administration -> User groups -> Guests -> Untick Enabled


Zabbix before version 4.4.0alpha2 stores credentials in the "users"
table with the password hash stored as a MD5 hash, which is a known
insecure hashing method. Furthermore, no salt is used with the hash.

CVE-2019-17382 (Disputed, not considered by upstream to be a security issue)

An issue was discovered in
zabbix.php?action=dashboard.view&dashboardid=1 in Zabbix through
4.4. An attacker can bypass the login page and access the dashboard
page, and then create a Dashboard, Report, Screen, or Map without
any Username/Password (i.e., anonymously). All created elements
(Dashboard/Report/Screen/Map) are accessible by other users and by
an admin.


Zabbix Frontend provides a feature that allows admins to
maintain the installation and ensure that only certain IP addresses
can access it. In this way, any user will not be able to access the
Zabbix Frontend while it is being maintained and possible sensitive
data will be prevented from being disclosed. An attacker can bypass
this protection and access the instance using IP address not listed
in the defined range.


JavaScript pre-processing can be used by the attacker to gain
access to the file system (read-only access on behalf of user
"zabbix") on the Zabbix Server or Zabbix Proxy, potentially leading
to unauthorized access to sensitive data.


Specially crafted string can cause a buffer overrun in the JSON
parser library leading to a crash of the Zabbix Server or a Zabbix


A Stored or persistent cross-site scripting (XSS) vulnerability
was found on “Users” section in “Media” tab in “Send to” form field.
When new media is created with malicious code included into field
“Send to” then it will execute when editing the same media.

Note: This issue was accidentially not mentioned in the debian changelog.


A Reflected XSS attacks, also known as non-persistent attacks, was
found where an attacker can pass malicious code as GET request to
graph.php and system will save it and will execute when current
graph page is opened.


URL validation scheme receives input from a user and then parses
it to identify its various components. The validation scheme can
ensure that all URL components comply with internet standards.


A Reflected XSS attacks, also known as non-persistent attacks, was
found where XSS session cookies could be revealed, enabling a
perpetrator to impersonate valid users and abuse their private

For Debian 8 jessie, these problems have been fixed in version 1:2.2.23+dfsg-0+deb8u5.

We recommend that you upgrade your zabbix packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.