Vulnerability in Xelerance Openswan
CVE-2018-15836
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
References
- lists.openswan.org/pipermail/users/2018-August/023761.html (Vendor Advisory, mailing-list, Release Notes)
- github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d (Patch, Vendor Advisory)
- github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-15836?
- CVE-2018-15836 is a high-severity vulnerability in Xelerance Openswan, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2018-09-26.
- How severe is CVE-2018-15836?
- High severity. CVSS v3 base score is 7.5 out of 10.