RSAREF 缓存溢出漏洞
发布日期：1999-12-01
更新日期：1999-12-02
受影响系统：RSA Security RSAREF 2.0
+ SSH Communications Security SSH 1.2.x
描述：
RSAREF密码库存在缓存溢出漏洞。
漏洞存在于rsa.c的四个函数中。
int RSAPublicEncrypt()
int RSAPrivateEncrypt()
int RSAPublicDecrypt()
int RSAPrivateDecrypt()
这些函数都定义了一个128字节长、叫做pkcsBlock局部变量，溢出由此产生，造成可以执
行任意代码。
建议：
RSA Security is no longer support the RSAREF library.
CORE SDI has developed the following fix for RSAREF. Copy this patch to a file named rsaref.patch in rsaref2/source, and apply with ''patch
- --- rsa.original.c Wed Dec 1 11:29:57 1999
+++ rsa.c Wed Dec 1 11:45:51 1999
@@ -33,6 +33,8 @@
unsigned char byte, pkcsBlock[MAX_RSA_MODULUS_LEN];
unsigned int i, modulusLen;
+ if (inputLen+3>MAX_RSA_MODULUS_LEN) return (RE_LEN);
+
modulusLen = (publicKey->bits + 7) / 8;
if (inputLen + 11 > modulusLen)
return (RE_LEN);
@@ -78,6 +80,8 @@
unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
unsigned int i, modulusLen, pkcsBlockLen;
+ if (inputLen>MAX_RSA_MODULUS_LEN) return (RE_LEN);
+
modulusLen = (publicKey->bits + 7) / 8;
if (inputLen > modulusLen)
return (RE_LEN);
@@ -129,6 +133,8 @@
unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
unsigned int i, modulusLen;
+ if (inputLen+3>MAX_RSA_MODULUS_LEN) return (RE_LEN);
+
modulusLen = (privateKey->bits + 7) / 8;
if (inputLen + 11 > modulusLen)
return (RE_LEN);
@@ -168,6 +174,8 @@
unsigned char pkcsBlock[MAX_RSA_MODULUS_LEN];
unsigned int i, modulusLen, pkcsBlockLen;
+ if (inputLen>MAX_RSA_MODULUS_LEN) return (RE_LEN);
+
modulusLen = (privateKey->bits + 7) / 8;
if (inputLen > modulusLen)
return (RE_LEN);
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