rdesktop versions up to and including v1.8.3 contain an Integer Overflow that leads to an Out-Of-Bounds Write in function process_bitmap_updates() and results in a memory corruption and possibly even a remote code execution.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - rdesktop: Remote code execution in ui_clip_handle_data (CVE-2018-8800)

  - rdesktop versions up to and including v1.8.3 contain an Out-Of-Bounds Read in the function     ui_clip_handle_data() that results in an information leak. (CVE-2018-20174)

  - rdesktop versions up to and including v1.8.3 contains several Integer Signedness errors that lead to Out-     Of-Bounds Reads in the file mcs.c and result in a Denial of Service (segfault). (CVE-2018-20175)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - rdesktop: Remote code execution in ui_clip_handle_data (CVE-2018-8800)

  - rdesktop versions up to and including v1.8.3 contain an Out-Of-Bounds Read in the function     ui_clip_handle_data() that results in an information leak. (CVE-2018-20174)

  - rdesktop versions up to and including v1.8.3 contains several Integer Signedness errors that lead to Out-     Of-Bounds Reads in the file mcs.c and result in a Denial of Service (segfault). (CVE-2018-20175)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This 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

The 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.

- 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

Multiple 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 'Jessie', these problems have been fixed in version 1.8.4-0+deb8u1.

We recommend that you upgrade your rdesktop 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.

Multiple security issues were found in the rdesktop RDP client, which could result in denial of service, information disclosure and the execution of arbitrary code.

Update 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.

ID	Name	Product	Family	Severity
199074	RHEL 5 : rdesktop (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
199010	RHEL 6 : rdesktop (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
128866	openSUSE Security Update : rdesktop (openSUSE-2019-2135)	Nessus	SuSE Local Security Checks	critical
122734	GLSA-201903-06 : rdesktop: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
122412	FreeBSD : rdesktop - critical - Remote Code Execution (3e2c9b63-223c-4575-af5c-816acb14e445)	Nessus	FreeBSD Local Security Checks	critical
122318	Debian DLA-1683-1 : rdesktop security update	Nessus	Debian Local Security Checks	critical
122271	Debian DSA-4394-1 : rdesktop - security update	Nessus	Debian Local Security Checks	critical
122134	Fedora 28 : rdesktop (2019-5146cd34e2)	Nessus	Fedora Local Security Checks	critical

Detections

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CVE-2018-8794

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