rdesktop up to 1.8.3 process_bitmap_updates integer overflow

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.5	$0-$5k	0.00

A vulnerability has been found in rdesktop up to 1.8.3 and classified as critical. This vulnerability affects the function process_bitmap_updates. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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 bug was discovered 02/05/2019. The weakness was presented 02/05/2019 (Website). The advisory is available at securityfocus.com. This vulnerability was named CVE-2018-8794 since 03/19/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 277595 (Fedora Security Update for rdesktop (FEDORA-2019-5146cd34e2)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106938†). See VDB-127328, VDB-127329, VDB-127330 and VDB-127331 for similar entries.

Productinfo

Name

rdesktop

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

03/19/2018 🔍
02/05/2019 +323 days 🔍
02/05/2019 +0 days 🔍
02/05/2019 +0 days 🔍
02/06/2019 +1 days 🔍
07/06/2023 +1611 days 🔍

Sourcesinfo

Advisory: DLA 1683-1⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-8794 (🔍)
SecurityFocus: 106938 - RDP Client 'FreeRDP' And 'rdesktop' Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 02/06/2019 01:50 PM
Updated: 07/06/2023 10:53 AM
Changes: 02/06/2019 01:50 PM (57), 05/08/2020 02:51 PM (5), 07/06/2023 10:53 AM (4)
Complete: 🔍
Cache ID: 18:C4E:40