CVE-2018-16149

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.

CVSS v3.0

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

CVSS v2.0

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

EPSS

0.70% chance of exploitation in the next 30 days, 51th 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-2018-16148
• CVE-2018-16156
• CVE-2018-16147
• CVE-2018-16158
• CVE-2018-16146
• CVE-2018-16159