Insecure Transportation Security Protocol Supported (SSLv2)
Severity: High
Summary
Netsparker detected that insecure transportation security protocol (SSLv2) is supported by your web server.
SSLv2 has several flaws. For example, your secure traffic can be observed when you have established it over SSLv2.
Impact
Attackers can perform man-in-the-middle attacks and observe the encryption traffic between your website and its visitors. Also an attacker can exploit vulnerabilities like DROWN.
Remediation
- Configure your web server to disallow using weak ciphers.
- For Apache, you should modify the SSLProtocol directive in the
httpd.conf.SSLProtocol +TLSv1.1 +TLSv1.2
- For Microsoft IIS, you should make some changes on the system registry.
- Click Start, click Run, type regedt32 or type regedit, and then click OK.
- In Registry Editor, locate the following registry key: HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL2\
- Locate a key named "Server." If it doesn't exist, create it.
- Under the "Server" key, locate a DWORD value named "Enabled." If it doesn't exist, create it and set it to "0".
Classifications
PCI v3.1-6.5.4, PCI v3.2-6.5.4, CAPEC-217, WASC-4, OWASP 2013-A6
, CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C
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