VDB-131816 · CVE-2018-20177 · BID 106938

rdesktop up to 1.8.3 rdp_in_unistr integer overflow

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

Summaryinfo

A vulnerability was found in rdesktop up to 1.8.3. It has been declared as critical. This vulnerability affects the function rdp_in_unistr. Such manipulation leads to integer overflow. This vulnerability is documented as CVE-2018-20177. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in rdesktop up to 1.8.3. Affected by this issue is the function rdp_in_unistr. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

rdesktop versions up to and including v1.8.3 contain an Integer Overflow that leads to a Heap-Based Buffer Overflow in the function rdp_in_unistr() and results in memory corruption and possibly even a remote code execution.

The bug was discovered 02/05/2019. The weakness was released 03/15/2019 (Website). The advisory is shared for download at research.checkpoint.com. This vulnerability is handled as CVE-2018-20177 since 12/17/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 38 days. During that time the estimated underground price was around $0-$5k. 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†). Entries connected to this vulnerability are available at VDB-127328, VDB-127329, VDB-127330 and VDB-127331. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

rdesktop

Version

License

open-source

Website

Product: https://github.com/rdesktop/rdesktop/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

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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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

12/17/2018 🔍
02/05/2019 +50 days 🔍
02/05/2019 +0 days 🔍
03/15/2019 +38 days 🔍
03/16/2019 +1 days 🔍
08/01/2023 +1599 days 🔍

Sourcesinfo

Product: github.com

Advisory: 4dca546d04321a610c1835010b5dad85163b65e1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-20177 (🔍)
GCVE (CVE): GCVE-0-2018-20177
GCVE (VulDB): GCVE-100-131816
SecurityFocus: 106938 - RDP Client 'FreeRDP' And 'rdesktop' Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 03/16/2019 07:48
Updated: 08/01/2023 18:26
Changes: 03/16/2019 07:48 (59), 05/17/2020 09:19 (4), 08/01/2023 18:18 (4), 08/01/2023 18:26 (1)
Complete: 🔍
Cache ID: 216::103

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