From 94d23fcff9b2a7a8368dfe52214d5c2569882c11 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Thu, 19 Aug 2021 12:24:17 +0100 Subject: [PATCH] Fix EC_GROUP_new_from_ecparameters to check the base length Check that there's at least one byte in params->base before trying to read it. CVE-2021-3712 Reviewed-by: Viktor Dukhovni Reviewed-by: Paul Dale --- crypto/ec/ec_asn1.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/crypto/ec/ec_asn1.c b/crypto/ec/ec_asn1.c index 7b7c75ce84..e497a25909 100644 --- a/crypto/ec/ec_asn1.c +++ b/crypto/ec/ec_asn1.c @@ -761,7 +761,10 @@ EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) ret->seed_len = params->curve->seed->length; } - if (!params->order || !params->base || !params->base->data) { + if (params->order == NULL + || params->base == NULL + || params->base->data == NULL + || params->base->length == 0) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); goto err; } -- 2.25.1