CVE-2017-9788

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value
placeholder in [Proxy-]Authorization headers of type ‘Digest’ was not
initialized or reset before or between successive key=value assignments by
mod_auth_digest. Providing an initial key with no ‘=’ assignment could
reflect the stale value of uninitialized pool memory used by the prior
request, leading to leakage of potentially confidential information, and a
segfault in other cases resulting in denial of service.