According to the versions of the httpd packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A specially crafted request could have crashed the     Apache HTTP Server prior to version 2.4.30, due to an     out of bound access after a size limit is reached by     reading the HTTP header. This vulnerability is     considered very hard if not impossible to trigger in     non-debug mode (both log and build level), so it is     classified as low risk for common server     usage.(CVE-2018-1301)

  - In Apache httpd 2.4.0 to 2.4.29, when mod_session is     configured to forward its session data to CGI     applications (SessionEnv on, not the default), a remote     user may influence their content by using a 'Session'     header. This comes from the 'HTTP_SESSION' variable     name used by mod_session to forward its data to CGIs,     since the prefix 'HTTP_' is also used by the Apache     HTTP Server to pass HTTP header fields, per CGI     specifications.(CVE-2018-1283)

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

This plugin has been deprecated due to apache_2_4_33.nasl (plugin ID 122060) performing the same version check. Use apache_2_4_33.nasl (plugin ID 122060) instead.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3627-1 advisory.

    Alex Nichols and Jakob Hirsch discovered that the Apache HTTP Server mod_authnz_ldap module incorrectly     handled missing charset encoding headers. A remote attacker could possibly use this issue to cause the     server to crash, resulting in a denial of service. (CVE-2017-15710)

    Elar Lang discovered that the Apache HTTP Server incorrectly handled certain characters specified in     <FilesMatch>. A remote attacker could possibly use this issue to upload certain files, contrary to     expectations. (CVE-2017-15715)

    It was discovered that the Apache HTTP Server mod_session module incorrectly handled certain headers. A     remote attacker could possibly use this issue to influence session data. (CVE-2018-1283)

    Robert Swiecki discovered that the Apache HTTP Server incorrectly handled certain requests. A remote     attacker could possibly use this issue to cause the server to crash, leading to a denial of service.
    (CVE-2018-1301)

    Robert Swiecki discovered that the Apache HTTP Server mod_cache_socache module incorrectly handled certain     headers. A remote attacker could possibly use this issue to cause the server to crash, leading to a denial     of service. (CVE-2018-1303)

    Nicolas Daniels discovered that the Apache HTTP Server incorrectly generated the nonce when creating HTTP     Digest authentication challenges. A remote attacker could possibly use this issue to replay HTTP requests     across a cluster of servers. (CVE-2018-1312)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

Use-after-free on HTTP/2 stream shutdown

When an HTTP/2 stream was destroyed after being handled, the Apache HTTP Server prior to version 2.4.30 could have written a NULL pointer potentially to an already freed memory. The memory pools maintained by the server make this vulnerability hard to trigger in usual configurations, the reporter and the team could not reproduce it outside debug builds, so it is classified as low risk. (CVE-2018-1302)

Bypass with a trailing newline in the file name

In Apache httpd 2.4.0 to 2.4.29, the expression specified in <FilesMatch> could match '$' to a newline character in a malicious filename, rather than matching only the end of the filename. This could be exploited in environments where uploads of some files are are externally blocked, but only by matching the trailing portion of the filename. (CVE-2017-15715)

Out of bounds read in mod_cache_socache can allow a remote attacker to cause a denial of service

A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while preparing data to be cached in shared memory. It could be used as a Denial of Service attack against users of mod_cache_socache. The vulnerability is considered as low risk since mod_cache_socache is not widely used, mod_cache_disk is not concerned by this vulnerability.
(CVE-2018-1303)

Improper handling of headers in mod_session can allow a remote user to modify session data for CGI applications

It has been discovered that the mod_session module of Apache HTTP Server (httpd), through version 2.4.29, has an improper input validation flaw in the way it handles HTTP session headers in some configurations. A remote attacker may influence their content by using a 'Session' header. (CVE-2018-1283)

Out of bound write in mod_authnz_ldap when using too small Accept-Language values

In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
(CVE-2017-15710)

Out of bound access after failure in reading the HTTP request

A specially crafted request could have crashed the Apache HTTP Server prior to version 2.4.30, due to an out of bound access after a size limit is reached by reading the HTTP header. This vulnerability is considered very hard if not impossible to trigger in non-debug mode (both log and build level), so it is classified as low risk for common server usage. (CVE-2018-1301)

Weak Digest auth nonce generation in mod_auth_digest

In Apache httpd 2.2.0 to 2.4.29, when generating an HTTP Digest authentication challenge, the nonce sent to prevent reply attacks was not correctly generated using a pseudo-random seed. In a cluster of servers using a common Digest authentication configuration, HTTP requests could be replayed across servers by an attacker without detection. (CVE-2018-1312)

This update for apache2 fixes the following issues :

  - CVE-2018-1283: when mod_session is configured to forward     its session data to CGI applications (SessionEnv on, not     the default), a remote user may influence their content     by using a \'Session\' header leading to unexpected     behavior [bsc#1086814].

  - CVE-2018-1301: due to an out of bound access after a     size limit being reached by reading the HTTP header, a     specially crafted request could lead to remote denial of     service. [bsc#1086817]

  - CVE-2018-1303: a specially crafted HTTP request header     could lead to crash due to an out of bound read while     preparing data to be cached in shared     memory.[bsc#1086813]

  - CVE-2017-15715: a regular expression could match '$' to     a newline character in a malicious filename, rather than     matching only the end of the filename. leading to     corruption of uploaded files.[bsc#1086774]

  - CVE-2018-1312: when generating an HTTP Digest     authentication challenge, the nonce sent to prevent     reply attacks was not correctly generated using a     pseudo-random seed. In a cluster of servers using a     common Digest authentication configuration, HTTP     requests could be replayed across servers by an attacker     without detection. [bsc#1086775]

  - CVE-2017-15710: mod_authnz_ldap, if configured with     AuthLDAPCharsetConfig, uses the Accept-Language header     value to lookup the right charset encoding when     verifying the user's credentials. If the header value is     not present in the charset conversion table, a fallback     mechanism is used to truncate it to a two characters     value to allow a quick retry (for example, 'en-US' is     truncated to 'en'). A header value of less than two     characters forces an out of bound write of one NUL byte     to a memory location that is not part of the string. In     the worst case, quite unlikely, the process would crash     which could be used as a Denial of Service attack. In     the more likely case, this memory is already reserved     for future use and the issue has no effect at all.
    [bsc#1086820]

  - CVE-2018-1302: when an HTTP/2 stream was destroyed after     being handled, it could have written a NULL pointer     potentially to an already freed memory. The memory pools     maintained by the server make this vulnerability hard to     trigger in usual configurations, the reporter and the     team could not reproduce it outside debug builds, so it     is classified as low risk. [bsc#1086820]

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.

This update includes the latest upstream release of the Apache HTTP Server, version 2.4.33. A number of security vulnerabilities are fixed in this release :

  - *Low*: Possible out of bound read in mod_cache_socache     (CVE-2018-1303)

  - *Low*: Possible out of bound access after failure in     reading the HTTP request (CVE-2018-1301)

  - *Low*: Weak Digest auth nonce generation in     mod_auth_digest (CVE-2018-1312)

  - *Low*: <FilesMatch> bypass with a trailing newline in     the file name (CVE-2017-15715)

  - *Low*: Out of bound write in mod_authnz_ldap when using     too small Accept-Language values (CVE-2017-15710)

  - *Moderate*: Tampering of mod_session data for CGI     applications (CVE-2018-1283)

For more information about changes in this release, see:
https://www.apache.org/dist/httpd/CHANGES_2.4.33

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

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.33. It is, therefore, affected by multiple vulnerabilities:

  - An out of bounds write vulnerability exists in mod_authnz_ldap     with AuthLDAPCharsetConfig enabled. An unauthenticated, remote     attacker can exploit this, via the Accept-Language header value,     to cause the application to stop responding. (CVE-2017-15710)  
  - An arbitrary file upload vulnerability exists in the FilesMatch     component where a malicious filename can be crafted to match the     expression check for a newline character. An unauthenticated,     remote attacker can exploit this, via newline character, to     upload arbitrary files on the remote host subject to the     privileges of the user. (CVE-2017-15715)

  - A session management vulnerability exists in the     mod_session component due to SessionEnv being enabled and     forwarding it's session data to the CGI Application. An     unauthenticated, remote attacker can exploit this, via     tampering the HTTP_SESSION and using a session header, to     influence content. (CVE-2018-1283)

  - An out of bounds access vulnerability exists when the size limit     is reached. An unauthenticated, remote attacker can exploit this,     to cause the Apache HTTP Server to crash. (CVE-2018-1301)

  - A write after free vulnerability exists in HTTP/2 stream due to     a NULL pointer being written to an area of freed memory. An     unauthenticated, remote attacker can exploit this to execute     arbitrary code. (CVE-2018-1302)   
  - An out of bounds read vulnerability exists in mod_cache_socache.
    An unauthenticated, remote attacker can exploit this, via a     specially crafted HTTP request header to cause the application     to stop responding. (CVE-2018-1303)

  - A weak digest vulnerability exists in the HTTP digest     authentication challenge.  An unauthenticated, remote attacker     can exploit this in a cluster of servers configured to use a     common digest authentication, to replay HTTP requests across     servers without being detected. (CVE-2018-1312)

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

The Apache httpd reports :

Out of bound write in mod_authnz_ldap with AuthLDAPCharsetConfig enabled (CVE-2017-15710)

mod_session: CGI-like applications that intend to read from mod_session's 'SessionEnv ON' could be fooled into reading user-supplied data instead. (CVE-2018-1283)

mod_cache_socache: Fix request headers parsing to avoid a possible crash with specially crafted input data. (CVE-2018-1303)

core: Possible crash with excessively long HTTP request headers.
Impractical to exploit with a production build and production LogLevel. (CVE-2018-1301)

core: Configure the regular expression engine to match '$' to the end of the input string only, excluding matching the end of any embedded newline characters. Behavior can be changed with new directive 'RegexDefaultOptions'. (CVE-2017-15715)

mod_auth_digest: Fix generation of nonce values to prevent replay attacks across servers using a common Digest domain. This change may cause problems if used with round robin load balancers.
(CVE-2018-1312)

mod_http2: Potential crash w/ mod_http2. (CVE-2018-1302)

ID	Name	Product	Family	Published	Updated	Severity
132128	EulerOS 2.0 SP3 : httpd (EulerOS-SA-2019-2593)	Nessus	Huawei Local Security Checks	12/18/2019	2/21/2025	medium
108758	Apache 2.4.x < 2.4.33 Multiple Vulnerabilities (deprecated)	Nessus	Web Servers	3/30/2018	1/28/2021	critical
109199	Ubuntu 14.04 LTS / 16.04 LTS : Apache HTTP Server vulnerabilities (USN-3627-1)	Nessus	Ubuntu Local Security Checks	4/20/2018	8/27/2024	critical
109555	Amazon Linux AMI : httpd24 (ALAS-2018-1004)	Nessus	Amazon Linux Local Security Checks	5/4/2018	10/14/2024	critical
109598	SUSE SLES12 Security Update : apache2 (SUSE-SU-2018:1161-1)	Nessus	SuSE Local Security Checks	5/8/2018	10/11/2024	critical
120484	Fedora 28 : httpd (2018-6744ca470d)	Nessus	Fedora Local Security Checks	1/3/2019	7/5/2024	critical
122060	Apache 2.4.x < 2.4.33 Multiple Vulnerabilities	Nessus	Web Servers	2/8/2019	4/11/2022	critical
108626	FreeBSD : apache -- multiple vulnerabilities (f38187e7-2f6e-11e8-8f07-b499baebfeaf)	Nessus	FreeBSD Local Security Checks	3/27/2018	12/6/2024	critical

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