CVE-2018-15836 — Improper Verification of Cryptographic Signature in Openswan
Severity
7.5HIGHNVD
EPSS
0.1%
top 64.62%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedSep 26
Latest updateMay 14
Description
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitability: 3.9 | Impact: 3.6
Affected Packages1 packages
Patches
🔴Vulnerability Details
1📋Vendor Advisories
1Red Hat▶
openswan: Improper signature verification in try_RSA_signature_v2() fucntion for RSASSA-PKCS1-v1_5 signature scheme↗2018-08-17
💬Community
1Bugzilla▶
CVE-2018-15836 openswan: Improper signature verification in try_RSA_signature_v2() fucntion for RSASSA-PKCS1-v1_5 signature scheme↗2018-08-17