Vulnerability Details : 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.
Products affected by CVE-2018-15836
- cpe:2.3:a:xelerance:openswan:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-15836
0.16%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-15836
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2018-15836
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-15836
-
https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d
wo#7449 . verify padding contents for IKEv2 RSA sig check · xelerance/Openswan@9eaa6c2 · GitHubPatch;Vendor Advisory
-
https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51
Update VERSION to 2.6.50.1 · xelerance/Openswan@0b460be · GitHubPatch;Vendor Advisory
-
https://lists.openswan.org/pipermail/users/2018-August/023761.html
[Openswan Users] Xelerance has released Openswan 2.6.50.1Release Notes;Vendor Advisory
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