CVE-2018-16253

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568.

CVSS v3.0

5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2.0

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.62% chance of exploitation in the next 30 days, 47th percentile

Published

2018-11-07

Updated

2024-08-05

Proof-of-concept exploits (1)

• https://sourceforge.net/p/axtls/mailman/message/36459928/

References

• CVE Record
• NVD entry

Related

• CVE-2018-16252
• CVE-2018-16256
• CVE-2018-16247
• CVE-2018-16269
• CVE-2018-16233
• CVE-2018-16270