alpine 3.6
access weakness #488


Weakness Breakdown


An access weakness occurs when software does not properly implement permissions that could have unintended consequences if exploited by malicious actors. An example of this weakness is when a default username and password are set by the developer but do not get changed by the system administrator.

Warning code(s):

Ensure that umask is given most restrictive possible setting.

File Name:



The highlighted line of code below is the trigger point of this particular Alpine 3.6 access weakness.

         int cfd;

        if ((cfd = accept(fd, NULL, NULL)) < 0)
            avahi_log_error("accept(): %s", strerror(errno));
            client_new(s, cfd);

int simple_protocol_setup(const AvahiPoll *poll_api) {
    struct sockaddr_un sa;
    mode_t u;
    int n;


    server = avahi_new(Server, 1);
    server->poll_api = poll_api;
    server->remove_socket = 0;
    server->fd = -1;
    server->n_clients = 0;
    AVAHI_LLIST_HEAD_INIT(Client, server->clients);
    server->watch = NULL;

    u = umask(0000);

    if ((n = sd_listen_fds(1)) < 0) {
        avahi_log_warn("Failed to acquire systemd file descriptors: %s", strerror(-n));
        goto fail;

    if (n > 1) {
        avahi_log_warn("Too many systemd file descriptors passed.");
        goto fail;

    if (n == 1) {
        int r;

        if ((r = sd_is_socket(SD_LISTEN_FDS_START, AF_LOCAL, SOCK_STREAM, 1)) < 0) {
            avahi_log_warn("Passed systemd file descriptor is of wrong type: %s", strerror(-r));
            goto fail;

        server->fd = SD_LISTEN_FDS_START;

    } else {

        if ((server->fd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0) {
            avahi_log_warn("socket(AF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno)); 

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