Summaryinfo

A vulnerability marked as critical has been reported in rdesktop up to 1.8.3. This affects the function seamless_process_line. This manipulation causes memory corruption. This vulnerability is handled as CVE-2018-20182. The attack can be initiated remotely. There is not any exploit available. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Detailsinfo

A vulnerability was found in rdesktop up to 1.8.3. It has been declared as critical. Affected by this vulnerability is the function seamless_process_line. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

rdesktop versions up to and including v1.8.3 contain a Buffer Overflow over the global variables in the function seamless_process_line() that results in memory corruption and probably even a remote code execution.

The bug was discovered 02/05/2019. The weakness was released 03/15/2019 (Website). The advisory is shared at research.checkpoint.com. This vulnerability is known as CVE-2018-20182 since 12/17/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, 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 371697 (Remote Desktop Protocol Client 'rdesktop' 1.8.3 and Prior Multiple Security Vulnerabilities).

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. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• rdesktop

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3

License

• open-source

Website

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

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