Иван Гайдамакин

Сам спросил, сам ответил.

Вообщем эйпл тупо поменяло ответ переменной trustResult, теперь это kSecTrustResultProceed.
Прикладываю рабочий код с фиксом.

- (BOOL)IsMobileConfigInstalled {
    NSString *certPath = [[NSBundle mainBundle] pathForResource:@"cert" ofType:@"der"];
    NSData *certData = [NSData dataWithContentsOfFile:certPath];
    SecCertificateRef cert = NULL;
    if ([certData length]) {
        cert = SecCertificateCreateWithData(NULL, (__bridge CFDataRef) certData);
        if (cert != NULL) {
            CFStringRef certSummary = SecCertificateCopySubjectSummary(cert);
            NSString *summaryString = [[NSString alloc] initWithString:(__bridge NSString *) certSummary];
            CFRelease(certSummary);
        }
    }
    SecPolicyRef policy = SecPolicyCreateBasicX509();
    SecTrustRef trust;
    OSStatus err = SecTrustCreateWithCertificates((__bridge CFArrayRef) @[
            (__bridge id) cert
    ], policy, &trust);
    SecTrustResultType trustResult = (SecTrustResultType) -1;
    err = SecTrustEvaluate(trust, &trustResult);
    CFRelease(trust);
    CFRelease(policy);
    CFRelease(cert);
    NSString *ver = [[UIDevice currentDevice] systemVersion];
    float ver_float = [ver floatValue];
    if (ver_float >= 11)
        return kSecTrustResultProceed == trustResult;
    return kSecTrustResultUnspecified == trustResult;
}