Description
The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.
Mitigation
Minimal update. May introduce new vulnerabilities or breaking changes.
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 debian 13 | | =8.4.11-1 || =8.4.16-1 || =8.4.16-1~deb13u1 || =8.4.20-1 || =8.4.21-1 || =8.4.21-1~deb13u1 || =8.4.22-1 || =8.4.23-1 || =8.4.23-1~deb13u1 || =8.4.24-1 || =8.4.24-1~deb13u1 || >=0 <8.4.26-1~deb13u1 | 8.4.26-1~deb13u1 |
debian 14 | | =8.4.11-1 || =8.4.16-1 || =8.4.16-1~deb13u1 || =8.4.20-1 || =8.4.21-1 || =8.4.21-1~deb13u1 || =8.4.22-1 || =8.4.23-1 || =8.4.23-1~deb13u1 || =8.4.24-1 || =8.4.24-1~deb13u1 || =8.4.26-1~deb13u1 || >=0 <8.4.26-1 | 8.4.26-1 |
debian 12 | | =8.2.10-1 || =8.2.10-2 || =8.2.12-1 || =8.2.16-1 || =8.2.16-2 || =8.2.17-1 || =8.2.18-1 || =8.2.18-1~deb12u1 || =8.2.20-1~deb12u1 || =8.2.20-2 || =8.2.20-3 || =8.2.21-1 || =8.2.23-1 || =8.2.24-1 || =8.2.24-1~deb12u1 || =8.2.26-1~deb12u1 || =8.2.26-4 || =8.2.27-1 || =8.2.28-1~deb12u1 || =8.2.29-1~deb12u1 || =8.2.30-1~deb12u1 || =8.2.31-1~deb12u1 || =8.2.32-1~deb12u1 || =8.2.33-1~deb12u1 || =8.2.5-2 || =8.2.7-1 || =8.2.7-1.1 || =8.2.7-1.2 || =8.2.7-1~deb12u1 || >=0 <8.2.34-1~deb12u1 | 8.2.34-1~deb12u1 |
 rpm rhel10 | | - | - |
rpm rhel6 | | - | - |
rpm rhel7 | | - | - |
rpm rhel8 | | <0:7.4.33-8.module+el8.10.0+25117+30337cca | 0:7.4.33-8.module+el8.10.0+25117+30337cca |
rpm rhel9 | | - | - |
rpm rhel10 | | - | - |
