An exploitable code execution vulnerability exists in the authentication functionality of FreeRDP 2.0.0-beta1+android11. A specially crafted server response can cause an out-of-bounds write resulting in an exploitable condition. An attacker can compromise the server or use a man in the middle attack to trigger this vulnerability.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An exploitable code execution vulnerability exists in the authentication functionality of FreeRDP     2.0.0-beta1+android11. A specially crafted server response can cause an out-of-bounds write resulting in     an exploitable condition. An attacker can compromise the server or use a man in the middle attack to     trigger this vulnerability. (CVE-2017-2834)

Note that Nessus relies on the presence of the package as reported by the vendor.

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

  - In FreeRDP after 1.0 and before 2.0.0, there is an     out-of-bound read in in update_read_bitmap_data that     allows client memory to be read to an image buffer. The     result displayed on screen as colour.(CVE-2020-11045)

  - libfreerdp/gdi/region.c in FreeRDP versions > 1.0     through 2.0.0-rc4 has an Integer     Overflow.(CVE-2020-11523)

  - In FreeRDP before version 2.1.2, there is a global OOB     read in update_read_cache_bitmap_v3_order. As a     workaround, one can disable bitmap cache with
    -bitmap-cache (default). This is fixed in version     2.1.2.(CVE-2020-11096)

  - An exploitable code execution vulnerability exists in     the authentication functionality of FreeRDP     2.0.0-beta1+android11. A specially crafted server     response can cause an out-of-bounds write resulting in     an exploitable condition. An attacker can compromise     the server or use a man in the middle attack to trigger     this vulnerability.(CVE-2017-2834)

  - An exploitable code execution vulnerability exists in     the RDP receive functionality of FreeRDP     2.0.0-beta1+android11. A specially crafted server     response can cause an out-of-bounds write resulting in     an exploitable condition. An attacker can compromise     the server or use a man in the middle to trigger this     vulnerability.(CVE-2017-2835)

  - An exploitable denial of service vulnerability exists     within the reading of proprietary server certificates     in FreeRDP 2.0.0-beta1+android11. A specially crafted     challenge packet can cause the program termination     leading to a denial of service condition. An attacker     can compromise the server or use man in the middle to     trigger this vulnerability.(CVE-2017-2836)

  - An exploitable denial of service vulnerability exists     within the handling of security data in FreeRDP     2.0.0-beta1+android11. A specially crafted challenge     packet can cause the program termination leading to a     denial of service condition. An attacker can compromise     the server or use man in the middle to trigger this     vulnerability.(CVE-2017-2837)

  - An exploitable denial of service vulnerability exists     within the handling of challenge packets in FreeRDP     2.0.0-beta1+android11. A specially crafted challenge     packet can cause the program termination leading to a     denial of service condition. An attacker can compromise     the server or use man in the middle to trigger this     vulnerability.(CVE-2017-2838)

  - An exploitable denial of service vulnerability exists     within the handling of challenge packets in FreeRDP     2.0.0-beta1+android11. A specially crafted challenge     packet can cause the program termination leading to a     denial of service condition. An attacker can compromise     the server or use man in the middle to trigger this     vulnerability.(CVE-2017-2839)

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 update for freerdp fixes the following issues :

  - CVE-2017-2834: Out-of-bounds write in license_recv()     (bsc#1050714)

  - CVE-2017-2835: Out-of-bounds write in rdp_recv_tpkt_pdu     (bsc#1050712)

  - CVE-2017-2836: Rdp Client Read Server Proprietary     Certificate Denial of Service (bsc#1050699)

  - CVE-2017-2837: Client GCC Read Server Security Data DoS     (bsc#1050704)

  - CVE-2017-2838: Client License Read Product Info Denial     of Service Vulnerability (bsc#1050708)

  - CVE-2017-2839: Client License Read Challenge Packet     Denial of Service (bsc#1050711)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This update for freerdp fixes the following issues :

  - CVE-2017-2834: Out-of-bounds write in license_recv()     (bsc#1050714)

  - CVE-2017-2835: Out-of-bounds write in rdp_recv_tpkt_pdu     (bsc#1050712)

  - CVE-2017-2836: Rdp Client Read Server Proprietary     Certificate Denial of Service (bsc#1050699)

  - CVE-2017-2837: Client GCC Read Server Security Data DoS     (bsc#1050704)

  - CVE-2017-2838: Client License Read Product Info Denial     of Service Vulnerability (bsc#1050708)

  - CVE-2017-2839: Client License Read Challenge Packet     Denial of Service (bsc#1050711)

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.

Update to latest snapshot that contains fixes for the latest Talos discovered CVEs.

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.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3380-1 advisory.

    It was discovered that FreeRDP incorrectly handled certain width and height values. A malicious server     could use this issue to cause FreeRDP to crash, resulting in a denial of service, or possibly execute     arbitrary code. This issue only applied to Ubuntu 14.04 LTS. (CVE-2014-0250)

    It was discovered that FreeRDP incorrectly handled certain values in a Scope List. A malicious server     could use this issue to cause FreeRDP to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2014-0791)

    Tyler Bohan discovered that FreeRDP incorrectly handled certain length values. A malicious server could     use this issue to cause FreeRDP to crash, resulting in a denial of service, or possibly execute arbitrary     code. (CVE-2017-2834, CVE-2017-2835)

    Tyler Bohan discovered that FreeRDP incorrectly handled certain packets. A malicious server could possibly     use this issue to cause FreeRDP to crash, resulting in a denial of service. (CVE-2017-2836, CVE-2017-2837,     CVE-2017-2838, CVE-2017-2839)

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.

Tyler Bohan of Talos discovered that FreeRDP, a free implementation of the Remote Desktop Protocol (RDP), contained several vulnerabilities that allowed a malicious remote server or a man-in-the-middle to either cause a DoS by forcibly terminating the client, or execute arbitrary code on the client side.

ID	Name	Product	Family	Severity
220994	Linux Distros Unpatched Vulnerability : CVE-2017-2834	Nessus	Misc.	high
146158	EulerOS 2.0 SP5 : freerdp (EulerOS-SA-2021-1188)	Nessus	Huawei Local Security Checks	high
102945	openSUSE Security Update : freerdp (openSUSE-2017-992)	Nessus	SuSE Local Security Checks	high
102693	SUSE SLED12 Security Update : freerdp (SUSE-SU-2017:2234-1)	Nessus	SuSE Local Security Checks	high
102277	Fedora 25 : 2:freerdp / remmina (2017-ed31e1f941)	Nessus	Fedora Local Security Checks	high
102260	Ubuntu 14.04 LTS / 16.04 LTS : FreeRDP vulnerabilities (USN-3380-1)	Nessus	Ubuntu Local Security Checks	high
102097	Debian DSA-3923-1 : freerdp - security update	Nessus	Debian Local Security Checks	high
102088	Fedora 26 : 2:freerdp / remmina (2017-4bc09c2364)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2017-2834

high

Tenable Plugins

high

high

high

high

high

high

high

high