CVE-2018-15836

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Source
https://cve.org/CVERecord?id=CVE-2018-15836
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15836.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2018-15836
Published
2018-09-26T21:29:00.913Z
Modified
2026-04-11T12:27:42.573786Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

In verifysignedhash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

References

Affected packages

Git / github.com/xelerance/openswan

Affected ranges

Type
GIT
Repo
https://github.com/xelerance/openswan
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0b460be9e287fd335c8ce58129c67bf06065ef51
Fixed
9eaa6c2a823c1d2b58913506a15f9474bf857a3d
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.6.50.1"
        }
    ]
}

Affected versions

v2.*
v2.5.01
v2.5.03
v2.6.01
v2.6.03
v2.6.07
v2.6.14
v2.6.15
v2.6.16
v2.6.18
v2.6.19
v2.6.20
v2.6.21
v2.6.23
v2.6.24
v2.6.26
v2.6.29
v2.6.32
v2.6.34
v2.6.36
v2.6.37
v2.6.38
v2.6.40
v2.6.42
v2.6.43
v2.6.44
v2.6.45
v2.6.46
v2.6.47
v2.6.47.1
v2.6.48
v2.6.49
v2.6.50

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15836.json"
vanir_signatures_modified 
"2026-04-11T12:27:42Z"
vanir_signatures 
[
    {
        "deprecated": false,
        "target": {
            "file": "lib/liboswkeys/signatures.c",
            "function": "verify_signed_hash"
        },
        "signature_type": "Function",
        "digest": {
            "function_hash": "236529740792023782679289609660264815960",
            "length": 900.0
        },
        "signature_version": "v1",
        "source": "https://github.com/xelerance/openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d",
        "id": "CVE-2018-15836-1ac51d67"
    },
    {
        "deprecated": false,
        "target": {
            "file": "lib/liboswkeys/signatures.c"
        },
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "257282234818150788343041657178393295120",
                "142560450995371773859260608519618091601",
                "96950459911695153985521605877857233650",
                "81033830470151624835191227279492282264"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "source": "https://github.com/xelerance/openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d",
        "id": "CVE-2018-15836-2d94594d"
    }
]