Vulnerabilities > CVE-2018-8793 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
rdesktop
debian
CWE-119
nessus

Summary

rdesktop versions up to and including v1.8.3 contain a Heap-Based Buffer Overflow in function cssp_read_tsrequest() that results in a memory corruption and probably even a remote code execution.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_3E2C9B63223C4575AF5C816ACB14E445.NASL
    description- Fix memory corruption in process_bitmap_data - CVE-2018-8794 - Fix remote code execution in process_bitmap_data - CVE-2018-8795 - Fix remote code execution in process_plane - CVE-2018-8797 - Fix Denial of Service in mcs_recv_connect_response - CVE-2018-20175 - Fix Denial of Service in mcs_parse_domain_params - CVE-2018-20175 - Fix Denial of Service in sec_parse_crypt_info - CVE-2018-20176 - Fix Denial of Service in sec_recv - CVE-2018-20176 - Fix minor information leak in rdpdr_process - CVE-2018-8791 - Fix Denial of Service in cssp_read_tsrequest - CVE-2018-8792 - Fix remote code execution in cssp_read_tsrequest - CVE-2018-8793 - Fix Denial of Service in process_bitmap_data - CVE-2018-8796 - Fix minor information leak in rdpsnd_process_ping - CVE-2018-8798 - Fix Denial of Service in process_secondary_order - CVE-2018-8799 - Fix remote code execution in in ui_clip_handle_data - CVE-2018-8800 - Fix major information leak in ui_clip_handle_data - CVE-2018-20174 - Fix memory corruption in rdp_in_unistr - CVE-2018-20177 - Fix Denial of Service in process_demand_active - CVE-2018-20178 - Fix remote code execution in lspci_process - CVE-2018-20179 - Fix remote code execution in rdpsnddbg_process - CVE-2018-20180 - Fix remote code execution in seamless_process - CVE-2018-20181 - Fix remote code execution in seamless_process_line - CVE-2018-20182
    last seen2020-06-01
    modified2020-06-02
    plugin id122412
    published2019-02-25
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122412
    titleFreeBSD : rdesktop - critical - Remote Code Execution (3e2c9b63-223c-4575-af5c-816acb14e445)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from the FreeBSD VuXML database :
    #
    # Copyright 2003-2020 Jacques Vidrine and contributors
    #
    # Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
    # HTML, PDF, PostScript, RTF and so forth) with or without modification,
    # are permitted provided that the following conditions are met:
    # 1. Redistributions of source code (VuXML) must retain the above
    #    copyright notice, this list of conditions and the following
    #    disclaimer as the first lines of this file unmodified.
    # 2. Redistributions in compiled form (transformed to other DTDs,
    #    published online in any format, converted to PDF, PostScript,
    #    RTF and other formats) must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer
    #    in the documentation and/or other materials provided with the
    #    distribution.
    # 
    # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
    # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
    # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
    # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
    # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
    # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(122412);
      script_version("1.3");
      script_cvs_date("Date: 2020/02/07");
    
      script_cve_id("CVE-2018-20174", "CVE-2018-20175", "CVE-2018-20176", "CVE-2018-20177", "CVE-2018-20178", "CVE-2018-20179", "CVE-2018-20180", "CVE-2018-20181", "CVE-2018-20182", "CVE-2018-8791", "CVE-2018-8792", "CVE-2018-8793", "CVE-2018-8794", "CVE-2018-8795", "CVE-2018-8796", "CVE-2018-8797", "CVE-2018-8798", "CVE-2018-8799", "CVE-2018-8800");
    
      script_name(english:"FreeBSD : rdesktop - critical - Remote Code Execution (3e2c9b63-223c-4575-af5c-816acb14e445)");
      script_summary(english:"Checks for updated package in pkg_info output");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote FreeBSD host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "- Fix memory corruption in process_bitmap_data - CVE-2018-8794
    
    - Fix remote code execution in process_bitmap_data - CVE-2018-8795
    
    - Fix remote code execution in process_plane - CVE-2018-8797
    
    - Fix Denial of Service in mcs_recv_connect_response - CVE-2018-20175
    
    - Fix Denial of Service in mcs_parse_domain_params - CVE-2018-20175
    
    - Fix Denial of Service in sec_parse_crypt_info - CVE-2018-20176
    
    - Fix Denial of Service in sec_recv - CVE-2018-20176
    
    - Fix minor information leak in rdpdr_process - CVE-2018-8791
    
    - Fix Denial of Service in cssp_read_tsrequest - CVE-2018-8792
    
    - Fix remote code execution in cssp_read_tsrequest - CVE-2018-8793
    
    - Fix Denial of Service in process_bitmap_data - CVE-2018-8796
    
    - Fix minor information leak in rdpsnd_process_ping - CVE-2018-8798
    
    - Fix Denial of Service in process_secondary_order - CVE-2018-8799
    
    - Fix remote code execution in in ui_clip_handle_data - CVE-2018-8800
    
    - Fix major information leak in ui_clip_handle_data - CVE-2018-20174
    
    - Fix memory corruption in rdp_in_unistr - CVE-2018-20177
    
    - Fix Denial of Service in process_demand_active - CVE-2018-20178
    
    - Fix remote code execution in lspci_process - CVE-2018-20179
    
    - Fix remote code execution in rdpsnddbg_process - CVE-2018-20180
    
    - Fix remote code execution in seamless_process - CVE-2018-20181
    
    - Fix remote code execution in seamless_process_line - CVE-2018-20182"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://github.com/rdesktop/rdesktop/releases/tag/v1.8.4"
      );
      # https://vuxml.freebsd.org/freebsd/3e2c9b63-223c-4575-af5c-816acb14e445.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?db0e2c57"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected package.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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:freebsd:freebsd:rdesktop");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/02");
      script_set_attribute(attribute:"patch_publication_date", value:"2019/02/22");
      script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/25");
      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:"FreeBSD Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("freebsd_package.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
    if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    flag = 0;
    
    if (pkg_test(save_report:TRUE, pkg:"rdesktop<1.8.4")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
      else security_hole(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4394.NASL
    descriptionMultiple security issues were found in the rdesktop RDP client, which could result in denial of service, information disclosure and the execution of arbitrary code.
    last seen2020-06-01
    modified2020-06-02
    plugin id122271
    published2019-02-19
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122271
    titleDebian DSA-4394-1 : rdesktop - security update
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-2135.NASL
    descriptionThis update for rdesktop fixes the following issues : rdesktop was updated to 1.8.6 : - Fix protocol code handling new licenses rdesktop was updated to 1.8.5 : - Add bounds checking to protocol handling in order to fix many security problems when communicating with a malicious server. rdesktop was updated to 1.8.4 (fix for boo#1121448) : - Add rdp_protocol_error function that is used in several fixes - Refactor of process_bitmap_updates - Fix possible integer overflow in s_check_rem() on 32bit arch - Fix memory corruption in process_bitmap_data - CVE-2018-8794 - Fix remote code execution in process_bitmap_data - CVE-2018-8795 - Fix remote code execution in process_plane - CVE-2018-8797 - Fix Denial of Service in mcs_recv_connect_response - CVE-2018-20175 - Fix Denial of Service in mcs_parse_domain_params - CVE-2018-20175 - Fix Denial of Service in sec_parse_crypt_info - CVE-2018-20176 - Fix Denial of Service in sec_recv - CVE-2018-20176 - Fix minor information leak in rdpdr_process - CVE-2018-8791 - Fix Denial of Service in cssp_read_tsrequest - CVE-2018-8792 - Fix remote code execution in cssp_read_tsrequest - CVE-2018-8793 - Fix Denial of Service in process_bitmap_data - CVE-2018-8796 - Fix minor information leak in rdpsnd_process_ping - CVE-2018-8798 - Fix Denial of Service in process_secondary_order - CVE-2018-8799 - Fix remote code execution in in ui_clip_handle_data - CVE-2018-8800 - Fix major information leak in ui_clip_handle_data - CVE-2018-20174 - Fix memory corruption in rdp_in_unistr - CVE-2018-20177 - Fix Denial of Service in process_demand_active - CVE-2018-20178 - Fix remote code execution in lspci_process - CVE-2018-20179 - Fix remote code execution in rdpsnddbg_process - CVE-2018-20180 - Fix remote code execution in seamless_process - CVE-2018-20181 - Fix remote code execution in seamless_process_line - CVE-2018-20182 - Fix building against OpenSSL 1.1 - remove obsolete patches - rdesktop-Fix-OpenSSL-1.1-compability-issues.patch - rdesktop-Fix-crash-in-rdssl_cert_to_rkey.patch - update changes file - add missing info about bugzilla 1121448 - Added rdesktop-Fix-decryption.patch Patch from https://github.com/rdesktop/rdesktop/pull/334 to fix connections to VirtualBox. - update to 1.8.6 - Fix protocol code handling new licenses - update to 1.8.5 - Add bounds checking to protocol handling in order to fix many security problems when communicating with a malicious server. - Trim redundant wording from description. - Use %make_install. - update to 1.8.4 (fix for boo#1121448) - Add rdp_protocol_error function that is used in several fixes - Refactor of process_bitmap_updates - Fix possible integer overflow in s_check_rem() on 32bit arch - Fix memory corruption in process_bitmap_data - CVE-2018-8794 - Fix remote code execution in process_bitmap_data - CVE-2018-8795 - Fix remote code execution in process_plane - CVE-2018-8797 - Fix Denial of Service in mcs_recv_connect_response - CVE-2018-20175 - Fix Denial of Service in mcs_parse_domain_params - CVE-2018-20175 - Fix Denial of Service in sec_parse_crypt_info - CVE-2018-20176 - Fix Denial of Service in sec_recv - CVE-2018-20176 - Fix minor information leak in rdpdr_process - CVE-2018-8791 - Fix Denial of Service in cssp_read_tsrequest - CVE-2018-8792 - Fix remote code execution in cssp_read_tsrequest - CVE-2018-8793 - Fix Denial of Service in process_bitmap_data - CVE-2018-8796 - Fix minor information leak in rdpsnd_process_ping - CVE-2018-8798 - Fix Denial of Service in process_secondary_order - CVE-2018-8799 - Fix remote code execution in in ui_clip_handle_data - CVE-2018-8800 - Fix major information leak in ui_clip_handle_data - CVE-2018-20174 - Fix memory corruption in rdp_in_unistr - CVE-2018-20177 - Fix Denial of Service in process_demand_active - CVE-2018-20178 - Fix remote code execution in lspci_process - CVE-2018-20179 - Fix remote code execution in rdpsnddbg_process - CVE-2018-20180 - Fix remote code execution in seamless_process - CVE-2018-20181 - Fix remote code execution in seamless_process_line - CVE-2018-20182 - Fix building against OpenSSL 1.1
    last seen2020-06-01
    modified2020-06-02
    plugin id128866
    published2019-09-16
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/128866
    titleopenSUSE Security Update : rdesktop (openSUSE-2019-2135)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201903-06.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201903-06 (rdesktop: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in rdesktop. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could cause a Denial of Service condition, obtain sensitive information, or execute arbitrary code. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id122734
    published2019-03-11
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122734
    titleGLSA-201903-06 : rdesktop: Multiple vulnerabilities
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2019-5146CD34E2.NASL
    descriptionUpdate to 1.8.4. Security fix for CVE-2018-8794 CVE-2018-8795 CVE-2018-8797 CVE-2018-20175 CVE-2018-20176 CVE-2018-8791 CVE-2018-8792 CVE-2018-8793 CVE-2018-8796 CVE-2018-8798 CVE-2018-8799 CVE-2018-8800 CVE-2018-20174 CVE-2018-20177 CVE-2018-20178 CVE-2018-20179 CVE-2018-20180 CVE-2018-20181 CVE-2018-20182. 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.
    last seen2020-06-01
    modified2020-06-02
    plugin id122134
    published2019-02-13
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122134
    titleFedora 28 : rdesktop (2019-5146cd34e2)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1683.NASL
    descriptionMultiple security issues were found in the rdesktop RDP client, which could result in denial of service, information disclosure and the execution of arbitrary code. For Debian 8
    last seen2020-06-01
    modified2020-06-02
    plugin id122318
    published2019-02-20
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122318
    titleDebian DLA-1683-1 : rdesktop security update