LibVNC Server up to 0.9.12 libvncclient/cursor.c HandleCursorShape heap-based overflow

Summaryinfo

A vulnerability has been found in LibVNC Server up to 0.9.12 and classified as critical. This affects the function HandleCursorShape of the file libvncclient/cursor.c. This manipulation causes heap-based overflow. This vulnerability is tracked as CVE-2019-15690. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in LibVNC Server up to 0.9.12. It has been declared as critical. Affected by this vulnerability is the function HandleCursorShape of the file libvncclient/cursor.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

LibVNCServer 0.9.12 release and earlier contains heap buffer overflow vulnerability within the HandleCursorShape() function in libvncclient/cursor.c. An attacker sends cursor shapes with specially crafted dimensions, which can result in remote code execution.

The weakness was disclosed by Pavel Cheremushkin. The advisory is shared at ics-cert.kaspersky.com. This vulnerability is known as CVE-2019-15690 since 08/27/2019. 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 price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/24/2025).

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• LibVNC

Name

• Server

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11
• 0.9.12

CPE 2.3info

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• 🔍
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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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