This update for apache2 fixes the following issues :

CVE-2020-1934: mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server (bsc#1168404).

CVE-2020-1927: mod_rewrite configurations vulnerable to open redirect (bsc#1168407).

CVE-2020-1938: mod_proxy_ajp: Add 'secret' parameter to proxy workers to implement legacy AJP13 authentication (bsc#1169066).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several security vulnerabilities have been discovered in the Tomcat servlet and JSP engine.

WARNING: The fix for CVE-2020-1938 may disrupt services that rely on a working AJP configuration. The option secretRequired defaults to true now. You should define a secret in your server.xml or you can revert back by setting secretRequired to false.

CVE-2019-17563

When using FORM authentication with Apache Tomcat there was a narrow window where an attacker could perform a session fixation attack. The window was considered too narrow for an exploit to be practical but, erring on the side of caution, this issue has been treated as a security vulnerability.

CVE-2020-1935

In Apache Tomcat the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

CVE-2020-1938

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. Previously Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required.
. Note that Debian already disabled the AJP connector by default.
Mitigation is only required if the AJP port was made accessible to untrusted users.

CVE-2020-9484

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.

For Debian 8 'Jessie', these problems have been fixed in version 8.0.14-1+deb8u17.

We recommend that you upgrade your tomcat8 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0037 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2020-11023:
    In jQuery versions greater than or equal to 1.0.3 and before 3.5.0, passing HTML containing option     elements from untrusted sources - even after sanitizing it - to one of jQuery's DOM manipulation methods     (i.e. .html(), .append(), and others) may execute untrusted code. This problem is patched in jQuery 3.5.0.
    A flaw was found in jQuery. HTML containing option elements from untrusted sources are passed, even after     sanitizing, to one of jQuery's DOM manipulation methods, which may execute untrusted code. The highest     threat from this vulnerability is to data confidentiality and integrity.

    CVE-2020-15720:
    In Dogtag PKI through 10.8.3, the pki.client.PKIConnection class did not enable python-requests     certificate validation. Since the verify parameter was hard-coded in all request functions, it was not     possible to override the setting. As a result, tools making use of this class, such as the pki-server     command, may have been vulnerable to Person-in-the-Middle attacks in certain non-localhost use cases. This     is fixed in 10.9.0-b1. A flaw was found in PKI, where the dogtag's pki.client.PKIConnection class disables     the python-requests certificate validation. This flaw allows an attacker to intercept a connection between     a FreeIPA client and a server, and execute an active Man-in-the-Middle attack. The highest threat from     this vulnerability is to confidentiality and integrity.

    CVE-2020-1935:
    In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used     an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led     to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly     handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered     unlikely. A flaw was found in Apache Tomcat. The HTTP header parsing code used an approach to end-of-line     (EOL) parsing that allowed some invalid HTTP headers to be parsed as valid. This led to the possibility of     HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid     Transfer-Encoding header in a particular manner. The highest threat with this vulnerability is system     availability.

    CVE-2020-1938:
    When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to     Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP     connection. If such connections are available to an attacker, they can be exploited in ways that may be     surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped     with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected     (and recommended in the security guide) that this Connector would be disabled if not required. This     vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the     web application - processing any file in the web application as a JSP Further, if the web application     allowed file upload and stored those files within the web application (or the attacker was able to control     the content of the web application by some other means) then this, along with the ability to process a     file as a JSP, made remote code execution possible. It is important to note that mitigation is only     required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth     approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to     Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP     Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading     to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
    CVE-2020-1938 is a file read/inclusion vulnerability in the AJP connector in Apache Tomcat. This is     enabled by default with a default configuration port of 8009. A remote, unauthenticated attacker could     exploit this vulnerability to read web application files from a vulnerable server. In instances where the     vulnerable server allows file uploads, an attacker could upload malicious JavaServer Pages (JSP) code     within a variety of file types and trigger this vulnerability to gain remote code execution (RCE).

    CVE-2022-25762     If a web application sends a WebSocket message concurrently with the WebSocket connection closing when     running on Apache Tomcat 8.5.0 to 8.5.75 or Apache Tomcat 9.0.0.M1 to 9.0.20, it is possible that the     application will continue to use the socket after it has been closed. The error handling triggered in this     case could cause the a pooled object to be placed in the pool twice. This could result in subsequent     connections using the same object concurrently which could result in data being returned to the wrong use     and/or other errors.

    CVE-2021-3551:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 / 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1520 advisory.

    Red Hat JBoss Web Server is a fully integrated and certified set of components for hosting Java web     applications. It is comprised of the Apache Tomcat Servlet container, JBoss HTTP Connector (mod_cluster),     the PicketLink Vault extension for Apache Tomcat, and the Tomcat Native library.

    This release of Red Hat JBoss Web Server 5.3 serves as a replacement for Red Hat JBoss Web Server 5.2, and     includes bug fixes, enhancements, and component upgrades, which are documented in the Release Notes,     linked to in the References.

    Security Fix(es):

    * tomcat: Apache Tomcat AJP File Read/Inclusion Vulnerability (CVE-2020-1938)
    * tomcat: local privilege escalation (CVE-2019-12418)
    * tomcat: session fixation (CVE-2019-17563)
    * tomcat: Regression in handling of Transfer-Encoding header allows for HTTP request smuggling     (CVE-2019-17569)
    * tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling (CVE-2020-1935)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References     section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Apache Tomcat installed on the remote host version 7.0.x prior to 7.0.100, 8.5.x prior to 8.5.51, or 9.0.x prior to 9.0.31 is affected by an arbitrary file read vulnerability in its AJP protocol due to an implementation defect. A remote, unauthenticated attacker could exploit this to access files which, under normal conditions, would be restricted. If the Tomcat instance supports file uploads, the vulnerability could also be leveraged to achieve remote code execution.

ID	Name	Product	Family	Published	Updated	Severity
136662	SUSE SLES12 Security Update : apache2 (SUSE-SU-2020:1272-1)	Nessus	SuSE Local Security Checks	5/15/2020	1/11/2023	critical
136078	SUSE SLED15 / SLES15 Security Update : apache2 (SUSE-SU-2020:1126-1)	Nessus	SuSE Local Security Checks	4/29/2020	1/11/2023	critical
136951	Debian DLA-2209-1 : tomcat8 security update	Nessus	Debian Local Security Checks	5/29/2020	3/8/2024	critical
236419	Alibaba Cloud Linux 3 : 0037: pki-core:10.6 (ALINUX3-SA-2021:0037)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	10/1/2025	critical
135773	RHEL 6 / 7 / 8 : Red Hat JBoss Web Server 5.3 (Important) (RHSA-2020:1520)	Nessus	Red Hat Local Security Checks	4/21/2020	11/7/2024	critical
701269	Apache Tomcat 7.0.x < 7.0.100 / 8.5.x < 8.5.51 / 9.0.x < 9.0.31 Arbitrary File Read Vulnerability	Nessus Network Monitor	Web Servers	2/25/2020	2/25/2020	high

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