CVE-2020-11810

An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (PDATAV2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.

References

Affected packages

Git / github.com/openvpn/openvpn

Affected ranges

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

0 Unknown introduced commit / All previous commits are affected

Fixed

37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab

Introduced

307abe7b32e951ece58c7964b3fa72536aee6724

Fixed

37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-11810.json"

vanir_signatures

[
    {
        "digest": {
            "line_hashes": [
                "90943622108912467155850960296536084813",
                "99840981497638252770493070540255916633",
                "93249254339865075299320712538737073583",
                "72381888681462295647858487342054692821"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "target": {
            "file": "src/openvpn/multi.c"
        },
        "signature_type": "Line",
        "id": "CVE-2020-11810-aab14bc0",
        "source": "https://github.com/openvpn/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab",
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "271735853187244793999805235223739291986",
            "length": 4467.0
        },
        "signature_version": "v1",
        "target": {
            "file": "src/openvpn/multi.c",
            "function": "multi_process_incoming_link"
        },
        "signature_type": "Function",
        "id": "CVE-2020-11810-fcfb95a1",
        "source": "https://github.com/openvpn/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab",
        "deprecated": false
    }
]