Debian LTS: DLA-2279-1: tomcat8 security update

    Date 12 Jul 2020
    Posted By LinuxSecurity Advisories
    Several security vulnerabilities have been discovered in the Tomcat servlet and JSP engine.
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    Debian LTS Advisory DLA-2279-1               This email address is being protected from spambots. You need JavaScript enabled to view it.                     Markus Koschany
    July 12, 2020                      
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    Package        : tomcat8
    Version        : 8.5.54-0+deb9u2
    CVE ID         : CVE-2020-9484 CVE-2020-11996
    Debian Bug     : 961209
    Several security vulnerabilities have been discovered in the Tomcat
    servlet and JSP engine.
        When using Apache Tomcat and an attacker is able to control the
        contents and name of a file on the server; and b) the server is
        configured to use the PersistenceManager with a FileStore; and c)
        the PersistenceManager is configured with
        sessionAttributeValueClassNameFilter="null" (the default unless a
        SecurityManager is used) or a sufficiently lax filter to allow the
        attacker provided object to be deserialized; and d) the attacker
        knows the relative file path from the storage location used by
        FileStore to the file the attacker has control over; then, using a
        specifically crafted request, the attacker will be able to trigger
        remote code execution via deserialization of the file under their
        control. Note that all of conditions a) to d) must be true for the
        attack to succeed.
        A specially crafted sequence of HTTP/2 requests sent to Apache
        Tomcat could trigger high CPU usage for several seconds. If a
        sufficient number of such requests were made on concurrent HTTP/2
        connections, the server could become unresponsive.
    For Debian 9 stretch, these problems have been fixed in version
    We recommend that you upgrade your tomcat8 packages.
    For the detailed security status of tomcat8 please refer to
    its security tracker page at:
    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at:

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