[exim-dev] [Bug 1871] New: Incorrect LDAP unescaping

https://bugs.exim.org/show_bug.cgi?id=1871

            Bug ID: 1871
           Summary: Incorrect LDAP unescaping
           Product: Exim
           Version: 4.84
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Lookups
          Assignee: nigel@???
          Reporter: steve@???
                CC: exim-dev@???

Create a router with:
    address_data = user=some_user \
                   homedir=${quote:${lookup ldapm
{ldap:///ou=people,LDAP_DOMAIN?homeDirectory?sub?uid=some_user}}/Maildir}

And a transport with:
    user = ${extract{user}{$address_data}}
    directory = ${extract{homedir}{$address_data}}/Example

If the homeDirectory LDAP attribute contains commas they are doubled up in the
result. i.e. if the user's LDAP path is used as their home directory, LDAP may
contain a home directory of "/home/uid=example,ou=people,dc=example,dc=com" but
Exim will try to deliver the message to the path
"home/uid=example,,ou=people,,dc=example,,dc=com/Maildir/Example" (note the
doubled up commas).

This problem has appeared since Exim 4.72.

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