LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Libvncserver_Project Libvncserver
cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:*
|
— |
0.9.15
|
References 3
https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf20…
disclosure@vulncheck.com
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dere…
disclosure@vulncheck.com