High severity · published Sep 26, 2018
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…
7.5
CVSS
1.5%
EPSS
No
On KEV
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:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Openswan · Xelerance
before 2.6.50.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-15836
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-15836
Patch
https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51
Patch
https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d
Release Notes
https://lists.openswan.org/pipermail/users/2018-August/023761.html
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