Vulnerabilities > CVE-2018-10847 - Improper Authentication vulnerability in Prosody

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
prosody
CWE-287
nessus
NVD
Published: 2018-07-30
Updated: 2019-10-09

Summary

prosody before versions 0.10.2, 0.9.14 is vulnerable to an Authentication Bypass. Prosody did not verify that the virtual host associated with a user session remained the same across stream restarts. A user may authenticate to XMPP host A and migrate their authenticated session to XMPP host B of the same Prosody instance.

Vulnerable Configurations

Part Description Count
Application
Prosody
33

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2018-455803056D.NASL
    descriptionProsody 0.10.2 ============== See upstream
    last seen2020-06-05
    modified2018-06-11
    plugin id110426
    published2018-06-11
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110426
    titleFedora 27 : prosody (2018-455803056d)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2018-455803056d.
#

include("compat.inc");

if (description)
{
  script_id(110426);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2018-10847");
  script_xref(name:"FEDORA", value:"2018-455803056d");

  script_name(english:"Fedora 27 : prosody (2018-455803056d)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Prosody 0.10.2 ==============

See upstream's blog post at
https://blog.prosody.im/prosody-0-10-2-security-release/ for a full
overview of the release changes.

Prosody 0.10.2 fixes a cross-host authentication vulnerability,
CVE-2018-10847. The issue affects Prosody instances that have multiple
virtual hosts (including anonymous authenticated hosts). All versions
of Prosody before 0.9.14 and 0.10.2 are affected. A full security
advisory is available at https://prosody.im/security/advisory_20180531

Security

--------

  - mod_c2s: Do not allow the stream ‘to’ to
    change across stream restarts (fixes #1147)

Minor changes

-------------

  - mod_websocket: Store the request object on the session
    for use by other modules (fixes #1153)

  - mod_c2s: Avoid concatenating potential nil value (fixes
    #753)

  - core.certmanager: Allow all non-whitespace in service
    name (fixes #1019)

  - mod_disco: Skip code specific to disco on user accounts
    (avoids invoking usermanager, fixes #1150)

  - mod_bosh: Store the normalized hostname on session
    (fixes #1151)

  - MUC: Fix error logged when no persistent rooms present
    (fixes #1154)

Dowstream

----------

  - Changed log rotation from weekly/52 to local system
    defaults

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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://blog.prosody.im/prosody-0-10-2-security-release/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bodhi.fedoraproject.org/updates/FEDORA-2018-455803056d"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected prosody package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:prosody");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:27");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/11");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^27([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 27", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC27", reference:"prosody-0.10.2-1.fc27")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "prosody");
}
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-596.NASL
    descriptionThis update for prosody to version 0.10.2 fixes the following issues : This security issue was fixed : - CVE-2018-10847: Prevent insufficient validation of client-provided parameters during XMPP stream restarts. Authenticated users may have overriden the realm associated with their session, potentially bypassing security policies and allowing impersonation (bsc#1094890). These non-security issues were fixed : - mod_websocket: Store the request object on the session for use by other modules - mod_c2s: Avoid concatenating potential nil value - core.certmanager: Allow all non-whitespace in service name - mod_disco: Skip code specific to disco on user accounts - mod_bosh: Store the normalized hostname on session - MUC: Fix error logged when no persistent rooms present
    last seen2020-06-05
    modified2018-06-11
    plugin id110436
    published2018-06-11
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110436
    titleopenSUSE Security Update : prosody (openSUSE-2018-596)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2018-596.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(110436);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2018-10847");

  script_name(english:"openSUSE Security Update : prosody (openSUSE-2018-596)");
  script_summary(english:"Check for the openSUSE-2018-596 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for prosody to version 0.10.2 fixes the following issues :

This security issue was fixed :

  - CVE-2018-10847: Prevent insufficient validation of
    client-provided parameters during XMPP stream restarts.
    Authenticated users may have overriden the realm
    associated with their session, potentially bypassing
    security policies and allowing impersonation
    (bsc#1094890).

These non-security issues were fixed :

  - mod_websocket: Store the request object on the session
    for use by other modules

  - mod_c2s: Avoid concatenating potential nil value

  - core.certmanager: Allow all non-whitespace in service
    name

  - mod_disco: Skip code specific to disco on user accounts 

  - mod_bosh: Store the normalized hostname on session

  - MUC: Fix error logged when no persistent rooms present"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1094890"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected prosody packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE15\.0)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.0", reference:"prosody-0.10.2-lp150.3.6.2") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"prosody-debuginfo-0.10.2-lp150.3.6.2") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"prosody-debugsource-0.10.2-lp150.3.6.2") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "prosody / prosody-debuginfo / prosody-debugsource");
}
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-414.NASL
    descriptionThis update for prosody to version 0.10.2 fixes the following issues : This security issue was fixed : - CVE-2018-10847: Prevent insufficient validation of client-provided parameters during XMPP stream restarts. Authenticated users may have overriden the realm associated with their session, potentially bypassing security policies and allowing impersonation (bsc#1094890). These non-security issues were fixed : - mod_websocket: Store the request object on the session for use by other modules - mod_c2s: Avoid concatenating potential nil value - core.certmanager: Allow all non-whitespace in service name - mod_disco: Skip code specific to disco on user accounts - mod_bosh: Store the normalized hostname on session - MUC: Fix error logged when no persistent rooms present
    last seen2020-06-01
    modified2020-06-02
    plugin id123179
    published2019-03-27
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123179
    titleopenSUSE Security Update : prosody (openSUSE-2019-414)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2019-414.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(123179);
  script_version("1.2");
  script_cvs_date("Date: 2020/01/30");

  script_cve_id("CVE-2018-10847");

  script_name(english:"openSUSE Security Update : prosody (openSUSE-2019-414)");
  script_summary(english:"Check for the openSUSE-2019-414 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for prosody to version 0.10.2 fixes the following issues :

This security issue was fixed :

  - CVE-2018-10847: Prevent insufficient validation of
    client-provided parameters during XMPP stream restarts.
    Authenticated users may have overriden the realm
    associated with their session, potentially bypassing
    security policies and allowing impersonation
    (bsc#1094890).

These non-security issues were fixed :

  - mod_websocket: Store the request object on the session
    for use by other modules

  - mod_c2s: Avoid concatenating potential nil value

  - core.certmanager: Allow all non-whitespace in service
    name

  - mod_disco: Skip code specific to disco on user accounts 

  - mod_bosh: Store the normalized hostname on session

  - MUC: Fix error logged when no persistent rooms present"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1094890"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected prosody packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:prosody-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE15\.0)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.0", reference:"prosody-0.10.2-lp150.3.6.2") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"prosody-debuginfo-0.10.2-lp150.3.6.2") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"prosody-debugsource-0.10.2-lp150.3.6.2") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "prosody / prosody-debuginfo / prosody-debugsource");
}
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-597.NASL
    descriptionThis update for prosody fixes the following issues : This security issue was fixed : - CVE-2018-10847: Prevent insufficient validation of client-provided parameters during XMPP stream restarts. Authenticated users may have overriden the realm associated with their session, potentially bypassing security policies and allowing impersonation (bsc#1094890).
    last seen2020-06-05
    modified2018-06-12
    plugin id110472
    published2018-06-12
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110472
    titleopenSUSE Security Update : prosody (openSUSE-2018-597)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2018-18F8C6CE79.NASL
    descriptionProsody 0.10.2 ============== See upstream
    last seen2020-06-05
    modified2019-01-03
    plugin id120258
    published2019-01-03
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/120258
    titleFedora 28 : prosody (2018-18f8c6ce79)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4216.NASL
    descriptionIt was discovered that Prosody, a lightweight Jabber/XMPP server, does not properly validate client-provided parameters during XMPP stream restarts, allowing authenticated users to override the realm associated with their session, potentially bypassing security policies and allowing impersonation. Details can be found in the upstream advisory at https://prosody.im/security/advisory_20180531/
    last seen2020-06-01
    modified2020-06-02
    plugin id110317
    published2018-06-05
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110317
    titleDebian DSA-4216-1 : prosody - security update

References