{"id":"CVE-2018-15836","details":"In verify_signed_hash() 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.","modified":"2026-10-20T13:29:33.397729015Z","published":"2018-09-26T21:29:00.913Z","database_specific":{},"references":[{"type":"ADVISORY","url":"https://lists.openswan.org/pipermail/users/2018-August/023761.html"},{"type":"FIX","url":"https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51"},{"type":"FIX","url":"https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xelerance/openswan","events":[{"introduced":"0"},{"fixed":"0b460be9e287fd335c8ce58129c67bf06065ef51"},{"fixed":"9eaa6c2a823c1d2b58913506a15f9474bf857a3d"}],"database_specific":{"extracted_events":[{"source":"CPE_RANGE","cpe":"cpe:2.3:a:xelerance:openswan:*:*:*:*:*:*:*:*","range":[{"introduced":"0"},{"fixed":"2.6.50.1"}]},{"range":[{"fixed":"0b460be9e287fd335c8ce58129c67bf06065ef51"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"9eaa6c2a823c1d2b58913506a15f9474bf857a3d"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["v2.6.50","v2.6.49","v2.6.48","v2.6.47.1","v2.6.47","v2.6.46","v2.6.45","v2.6.43","v2.6.44","v2.6.42","v2.6.40","v2.6.38","v2.6.32","v2.6.37","v2.6.36","v2.6.34","v2.6.29","v2.6.26","v2.6.24","v2.6.23","v2.6.21","v2.6.20","v2.6.19","v2.6.18","v2.6.16","v2.6.15","v2.6.14","v2.6.07","v2.6.03","v2.6.01","v2.5.03","v2.5.01"],"database_specific":{"vanir_signatures_modified":"2026-10-20T13:29:33Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15836.json","vanir_signatures":[{"deprecated":false,"digest":{"length":900,"function_hash":"236529740792023782679289609660264815960"},"id":"CVE-2018-15836-1ac51d67","signature_type":"Function","signature_version":"v1","source":"https://github.com/xelerance/openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d","target":{"file":"lib/liboswkeys/signatures.c","function":"verify_signed_hash"}},{"target":{"file":"lib/liboswkeys/signatures.c"},"deprecated":false,"digest":{"line_hashes":["257282234818150788343041657178393295120","142560450995371773859260608519618091601","96950459911695153985521605877857233650","81033830470151624835191227279492282264"],"threshold":0.9},"id":"CVE-2018-15836-2d94594d","signature_type":"Line","signature_version":"v1","source":"https://github.com/xelerance/openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}