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AUSCERT External Security Bulletin Redistribution
ESB-2021.1660
jetty9 security update
17 May 2021
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AusCERT Security Bulletin Summary
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Product: jetty9
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Increased Privileges — Existing Account
Cross-site Scripting — Remote with User Interaction
Access Confidential Data — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27216 CVE-2019-10247 CVE-2019-10241
CVE-2018-12536 CVE-2017-9735
Reference: ASB-2021.0020
ASB-2021.0014
ESB-2021.0376
ESB-2020.4269
Original Bulletin:
https://www.debian.org/lts/security/2021/dla-2661
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Debian LTS Advisory DLA-2661-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Sylvain Beucler
May 14, 2021 https://wiki.debian.org/LTS
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Package : jetty9
Version : 9.2.30-0+deb9u1
CVE ID : CVE-2017-9735 CVE-2018-12536 CVE-2019-10241 CVE-2019-10247
CVE-2020-27216
Debian Bug : 864898 902774 928444
Several vulnerabilities were discovered in jetty, a Java servlet
engine and webserver. An attacker may reveal cryptographic credentials
such as passwords to a local user, disclose installation paths, hijack
user sessions or tamper with collocated webapps.
CVE-2017-9735
Jetty is prone to a timing channel in util/security/Password.java,
which makes it easier for remote attackers to obtain access by
observing elapsed times before rejection of incorrect passwords.
CVE-2018-12536
On webapps deployed using default Error Handling, when an
intentionally bad query arrives that doesn’t match a dynamic
url-pattern, and is eventually handled by the DefaultServlet’s
static file serving, the bad characters can trigger a
java.nio.file.InvalidPathException which includes the full path to
the base resource directory that the DefaultServlet and/or webapp
is using. If this InvalidPathException is then handled by the
default Error Handler, the InvalidPathException message is
included in the error response, revealing the full server path to
the requesting system.
CVE-2019-10241
The server is vulnerable to XSS conditions if a remote client USES
a specially formatted URL against the DefaultServlet or
ResourceHandler that is configured for showing a Listing of
directory contents.
CVE-2019-10247
The server running on any OS and Jetty version combination will
reveal the configured fully qualified directory base resource
location on the output of the 404 error for not finding a Context
that matches the requested path. The default server behavior on
jetty-distribution and jetty-home will include at the end of the
Handler tree a DefaultHandler, which is responsible for reporting
this 404 error, it presents the various configured contexts as
HTML for users to click through to. This produced HTML includes
output that contains the configured fully qualified directory base
resource location for each context.
CVE-2020-27216
On Unix like systems, the system’s temporary directory is shared
between all users on that system. A collocated user can observe
the process of creating a temporary sub directory in the shared
temporary directory and race to complete the creation of the
temporary subdirectory. If the attacker wins the race then they
will have read and write permission to the subdirectory used to
unpack web applications, including their WEB-INF/lib jar files and
JSP files. If any code is ever executed out of this temporary
directory, this can lead to a local privilege escalation
vulnerability.
This update also includes several other bug fixes and
improvements. For more information please refer to the upstream
changelog file.
For Debian 9 stretch, these problems have been fixed in version
9.2.30-0+deb9u1.
We recommend that you upgrade your jetty9 packages.
For the detailed security status of jetty9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/jetty9
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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which may arise from following or acting on information or advice contained in
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NOTE: This is only the original release of the security bulletin. It may
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Contact information for the authors of the original document is included
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
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