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View File openssl-0.9.8b-cve-2007-5135.patch of Package openssl098e2 (Project home:beerserc)

Possible one byte buffer overflow in SSL_get_shared_ciphers.
CVE-2007-5135
diff -up openssl-0.9.8b/ssl/ssl_lib.c.orig openssl-0.9.8b/ssl/ssl_lib.c
--- openssl-0.9.8b/ssl/ssl_lib.c.orig	2007-10-08 10:20:42.000000000 +0200
+++ openssl-0.9.8b/ssl/ssl_lib.c	2007-10-08 17:32:29.000000000 +0200
@@ -1201,7 +1201,6 @@ int SSL_set_cipher_list(SSL *s,const cha
 char *SSL_get_shared_ciphers(const SSL *s,char *buf,int len)
 	{
 	char *p;
-	const char *cp;
 	STACK_OF(SSL_CIPHER) *sk;
 	SSL_CIPHER *c;
 	int i;
@@ -1214,20 +1213,21 @@ char *SSL_get_shared_ciphers(const SSL *
 	sk=s->session->ciphers;
 	for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 		{
-		/* Decrement for either the ':' or a '\0' */
-		len--;
+		int n;
+
 		c=sk_SSL_CIPHER_value(sk,i);
-		for (cp=c->name; *cp; )
+		n=strlen(c->name);
+		if (n+1 > len)
 			{
-			if (len-- <= 0)
-				{
-				*p='\0';
-				return(buf);
-				}
-			else
-				*(p++)= *(cp++);
+			if (p != buf)
+				--p;
+			*p='\0';
+			return buf;
 			}
+		strcpy(p,c->name);
+		p+=n;
 		*(p++)=':';
+		len-=n+1;
 		}
 	p[-1]='\0';
 	return(buf);