From 65c0eaad449b809f827a177558a880522d18dd88 Mon Sep 17 00:00:00 2001 From: Richard Levitte Date: Fri, 12 May 2023 10:00:13 +0200 Subject: [PATCH 05/11] Restrict the size of OBJECT IDENTIFIERs that OBJ_obj2txt will translate OBJ_obj2txt() would translate any size OBJECT IDENTIFIER to canonical numeric text form. For gigantic sub-identifiers, this would take a very long time, the time complexity being O(n^2) where n is the size of that sub-identifier. To mitigate this, a restriction on the size that OBJ_obj2txt() will translate to canonical numeric text form is added, based on RFC 2578 (STD 58), which says this: > 3.5. OBJECT IDENTIFIER values > > An OBJECT IDENTIFIER value is an ordered list of non-negative numbers. > For the SMIv2, each number in the list is referred to as a sub-identifier, > there are at most 128 sub-identifiers in a value, and each sub-identifier > has a maximum value of 2^32-1 (4294967295 decimal). Fixes otc/security#96 Fixes CVE-2023-2650 Reviewed-by: Matt Caswell Reviewed-by: Tomas Mraz reference: https://github.com/openssl/openssl/commit/9e209944b35cf82368071f160a744b6178f9b098 Signed-off-by: yexiao --- .../openssl/crypto/objects/obj_dat.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/CryptoPkg/Library/OpensslLib/openssl/crypto/objects/obj_dat.c b/CryptoPkg/Library/OpensslLib/openssl/crypto/objects/obj_dat.c index 46006fe6..14206390 100644 --- a/CryptoPkg/Library/OpensslLib/openssl/crypto/objects/obj_dat.c +++ b/CryptoPkg/Library/OpensslLib/openssl/crypto/objects/obj_dat.c @@ -427,6 +427,25 @@ int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name) first = 1; bl = NULL; + /* + * RFC 2578 (STD 58) says this about OBJECT IDENTIFIERs: + * + * > 3.5. OBJECT IDENTIFIER values + * > + * > An OBJECT IDENTIFIER value is an ordered list of non-negative + * > numbers. For the SMIv2, each number in the list is referred to as a + * > sub-identifier, there are at most 128 sub-identifiers in a value, + * > and each sub-identifier has a maximum value of 2^32-1 (4294967295 + * > decimal). + * + * So a legitimate OID according to this RFC is at most (32 * 128 / 7), + * i.e. 586 bytes long. + * + * Ref: https://datatracker.ietf.org/doc/html/rfc2578#section-3.5 + */ + if (len > 586) + goto err; + while (len > 0) { l = 0; use_bn = 0; -- 2.33.0