CVE-2020-8794

OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mtaio in mtasession.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

References

Affected packages

Git / github.com/opensmtpd/opensmtpd

Affected ranges

Type: GIT
Repo: https://github.com/opensmtpd/opensmtpd
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

555d2121736acdd70453b24b94c8c2996d9ab5f9

Database specific

vanir_signatures

[
    {
        "source": "https://github.com/opensmtpd/opensmtpd/commit/555d2121736acdd70453b24b94c8c2996d9ab5f9",
        "target": {
            "function": "queue_fs_envelope_create",
            "file": "smtpd/queue_fs.c"
        },
        "id": "CVE-2020-8794-7da4040d",
        "deprecated": false,
        "signature_type": "Function",
        "signature_version": "v1",
        "digest": {
            "function_hash": "196875953881991152077236116624259068501",
            "length": 852.0
        }
    },
    {
        "source": "https://github.com/opensmtpd/opensmtpd/commit/555d2121736acdd70453b24b94c8c2996d9ab5f9",
        "target": {
            "file": "smtpd/queue_fs.c"
        },
        "id": "CVE-2020-8794-8fca902c",
        "deprecated": false,
        "signature_type": "Line",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "242575823212615086944252627364996250139",
                "191066550062516158912985716223257094754",
                "166787329513173112996708886338970170939",
                "256753418468187729585530898156176574718",
                "273979709428202467439049274088971250784"
            ],
            "threshold": 0.9
        }
    }
]