An issue was discovered in OpenDKIM through 2.10.3, and 2.11.x through 2.11.0-Beta2. It fails to keep track of ordinal numbers when removing fake Authentication-Results header fields, which allows a remote attacker to craft an e-mail message with a fake sender address such that programs that rely on Authentication-Results from OpenDKIM will treat the message as having a valid DKIM signature when in fact it has none.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.10.3"
},
{
"introduced": "0"
},
{
"last_affected": "2.11.0-beta0"
},
{
"introduced": "0"
},
{
"last_affected": "2.11.0-beta1"
},
{
"introduced": "0"
},
{
"last_affected": "2.11.0-beta2"
}
]
}