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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3301
              USN-4113-1: Apache HTTP Server vulnerabilities
                              30 August 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           apache2
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10098 CVE-2019-10097 CVE-2019-10092
                   CVE-2019-10082 CVE-2019-10081 CVE-2019-9517
                   CVE-2019-0197  

Reference:         ESB-2019.3289
                   ESB-2019.3133
                   ESB-2019.1156

Original Bulletin: 
   https://usn.ubuntu.com/4113-1/

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USN-4113-1: Apache HTTP Server vulnerabilities
29 August 2019

apache2 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.04
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Apache.

Software Description

  o apache2 - Apache HTTP server

Details

Stefan Eissing discovered that the HTTP/2 implementation in Apache did not
properly handle upgrade requests from HTTP/1.1 to HTTP/2 in some situations. A
remote attacker could use this to cause a denial of service (daemon crash).
This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-0197)

Craig Young discovered that a memory overwrite error existed in Apache when
performing HTTP/2 very early pushes in some situations. A remote attacker could
use this to cause a denial of service (daemon crash). This issue only affected
Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10081)

Craig Young discovered that a read-after-free error existed in the HTTP/2
implementation in Apache during connection shutdown. A remote attacker could
use this to possibly cause a denial of service (daemon crash) or possibly
expose sensitive information. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 19.04. (CVE-2019-10082)

Matei Badanoiu discovered that the mod_proxy component of Apache did not
properly filter URLs when reporting errors in some configurations. A remote
attacker could possibly use this issue to conduct cross-site scripting (XSS)
attacks. (CVE-2019-10092)

Daniel McCarney discovered that mod_remoteip component of Apache contained a
stack buffer overflow when parsing headers from a trusted intermediary proxy in
some situations. A remote attacker controlling a trusted proxy could use this
to cause a denial of service or possibly execute arbitrary code. This issue
only affected Ubuntu 19.04. (CVE-2019-10097)

Yukitsugu Sasaki discovered that the mod_rewrite component in Apache was
vulnerable to open redirects in some situations. A remote attacker could use
this to possibly expose sensitive information or bypass intended restrictions.
(CVE-2019-10098)

Jonathan Looney discovered that the HTTP/2 implementation in Apache did not
properly limit the amount of buffering for client connections in some
situations. A remote attacker could use this to cause a denial of service
(unresponsive daemon). This issue only affected Ubuntu 18.04 LTS and Ubuntu
19.04. (CVE-2019-9517)

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 19.04
    apache2 - 2.4.38-2ubuntu2.2
    apache2-bin - 2.4.38-2ubuntu2.2
Ubuntu 18.04 LTS
    apache2 - 2.4.29-1ubuntu4.10
    apache2-bin - 2.4.29-1ubuntu4.10
Ubuntu 16.04 LTS
    apache2 - 2.4.18-2ubuntu3.12
    apache2-bin - 2.4.18-2ubuntu3.12

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

In general, a standard system update will make all the necessary changes.

References

  o CVE-2019-0197
  o CVE-2019-10081
  o CVE-2019-10082
  o CVE-2019-10092
  o CVE-2019-10097
  o CVE-2019-10098
  o CVE-2019-9517

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