Description
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.
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c
Exploit, Patch, Third Party Advisory mailing-list
x_refsource_mlist
https://sourceforge.net/p/axtls/mailman/message/36459928/
Scores
CVSS v3
5.9
EPSS
0.0023
EPSS Percentile
45.2%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-347
Status
published
Products (1)
axtls_project/axtls
< 2.1.3
Published
Nov 07, 2018
Tracked Since
Feb 18, 2026