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31 lines
1.0 KiB
31 lines
1.0 KiB
1 year ago
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diff --git a/crypto/objects/obj_dat.c b/crypto/objects/obj_dat.c
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index 01cde00e98..c0e55197a0 100644
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--- a/crypto/objects/obj_dat.c
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+++ b/crypto/objects/obj_dat.c
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@@ -443,6 +443,25 @@ int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)
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first = 1;
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bl = NULL;
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+ /*
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+ * RFC 2578 (STD 58) says this about OBJECT IDENTIFIERs:
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+ *
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+ * > 3.5. OBJECT IDENTIFIER values
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+ * >
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+ * > An OBJECT IDENTIFIER value is an ordered list of non-negative
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+ * > numbers. For the SMIv2, each number in the list is referred to as a
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+ * > sub-identifier, there are at most 128 sub-identifiers in a value,
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+ * > and each sub-identifier has a maximum value of 2^32-1 (4294967295
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+ * > decimal).
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+ *
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+ * So a legitimate OID according to this RFC is at most (32 * 128 / 7),
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+ * i.e. 586 bytes long.
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+ *
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+ * Ref: https://datatracker.ietf.org/doc/html/rfc2578#section-3.5
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+ */
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+ if (len > 586)
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+ goto err;
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+
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while (len > 0) {
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l = 0;
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use_bn = 0;
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