sniproxy through 0.7.0 contains a NULL pointer dereference vulnerability in resolv_cancel() that allows remote unauthenticated attackers to crash the daemon by sending overlong hostnames. Attackers can send a 254 or 255 character TLS SNI name or HTTP Host header matching a wildcard backend, then close the connection to terminate the proxy.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
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
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 7
https://github.com/dlundquist/sniproxy
disclosure@vulncheck.com
https://github.com/dlundquist/sniproxy/blob/1cc625ea41796695a54593d1bd779366b82…
disclosure@vulncheck.com
https://github.com/dlundquist/sniproxy/blob/1cc625ea41796695a54593d1bd779366b82…
disclosure@vulncheck.com
https://github.com/dlundquist/sniproxy/issues/411
disclosure@vulncheck.com
https://github.com/renaudallard/sniproxy/commit/17986ba7397297313331297cac3b9eb…
disclosure@vulncheck.com
https://github.com/renaudallard/sniproxy/commit/d5d78290c8fe15d9aa12185d2c57739…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/sniproxy-through-0.7.0-null-pointer-derefe…
disclosure@vulncheck.com