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Advisories

LibVNCServer httpd proxy NULL Pointer Dereference

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severity
medium
date
Affecting

  • LibVNCServer <= 0.9.15 (fixed in commit dc78dee)

CWE
  • CWE-476 NULL Pointer Dereference
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
Description
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.

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