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Advisories

CivetWeb through 1.16 HTTP/2 Use-After-Free via Stale Pseudo-Header State

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Severity
critical
Date
Affecting

  • civetweb <= 1.16

CWE
  • CWE-416 Use After Free
CVSS
9.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
PuH4ck3rX, Lee Keon-Hyeong
Description
CivetWeb through 1.16, when built with USE_HTTP2 and enable_http2 on, contains a use-after-free vulnerability in handle_http2() that retains freed :method and :path pointers. Unauthenticated remote attackers can send a later HEADERS frame omitting these pseudo-headers to influence request method or path seen by access rules, or crash the server.

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