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30 lines
1.0 KiB
30 lines
1.0 KiB
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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