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Posted to dev@thrift.apache.org by "Alexis Wilke (JIRA)" <ji...@apache.org> on 2015/07/06 21:56:05 UTC
[jira] [Updated] (THRIFT-1844) Password string not cleared
[ https://issues.apache.org/jira/browse/THRIFT-1844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alexis Wilke updated THRIFT-1844:
---------------------------------
Description:
The function handling the SSL password receives a memory copy of the password which is then passed down to the OpenSSL library. The intermediate buffer used to get the password is not cleared one used up.
This is a (rather low) security issue in case a memory scraper was used. The buffer should be cleared once not necessary anymore.
The current function (in 0.9.0) looks like this:
{noformat}
int TSSLSocketFactory::passwordCallback(char* password,
int size,
int,
void* data) {
TSSLSocketFactory* factory = (TSSLSocketFactory*)data;
string userPassword;
factory->getPassword(userPassword, size);
int length = userPassword.size();
if (length > size) {
length = size;
}
strncpy(password, userPassword.c_str(), length);
return length;
}
{noformat}
After the strncpy() I would suggest something like this:
{noformat}
for(int i(userPassword.size()); i >= 0; --i) {
userPassword[i] = '*';
}
{noformat}
Note that we cannot use the variable size because it gets modified and thus does not represent the whole password size at that point.
was:
The function handling the SSL password receives a memory copy of the password which is then passed down to the OpenSSL library. The intermediate buffer used to get the password is not cleared one used up.
This is a (rather low) security issue in case a memory scraper was used. The buffer should be cleared once not necessary anymore.
The current function (in 0.9.0) looks like this:
int TSSLSocketFactory::passwordCallback(char* password,
int size,
int,
void* data) {
TSSLSocketFactory* factory = (TSSLSocketFactory*)data;
string userPassword;
factory->getPassword(userPassword, size);
int length = userPassword.size();
if (length > size) {
length = size;
}
strncpy(password, userPassword.c_str(), length);
return length;
}
After the strncpy() I would suggest something like this:
for(int i(userPassword.size()); i >= 0; --i) {
userPassword[i] = '*';
}
Note that we cannot use the variable size because it gets modified and thus does not represent the whole password size at that point.
> Password string not cleared
> ---------------------------
>
> Key: THRIFT-1844
> URL: https://issues.apache.org/jira/browse/THRIFT-1844
> Project: Thrift
> Issue Type: Bug
> Components: C++ - Library
> Affects Versions: 0.9
> Environment: SSL connection with authentication
> Reporter: Alexis Wilke
>
> The function handling the SSL password receives a memory copy of the password which is then passed down to the OpenSSL library. The intermediate buffer used to get the password is not cleared one used up.
> This is a (rather low) security issue in case a memory scraper was used. The buffer should be cleared once not necessary anymore.
> The current function (in 0.9.0) looks like this:
> {noformat}
> int TSSLSocketFactory::passwordCallback(char* password,
> int size,
> int,
> void* data) {
> TSSLSocketFactory* factory = (TSSLSocketFactory*)data;
> string userPassword;
> factory->getPassword(userPassword, size);
> int length = userPassword.size();
> if (length > size) {
> length = size;
> }
> strncpy(password, userPassword.c_str(), length);
> return length;
> }
> {noformat}
> After the strncpy() I would suggest something like this:
> {noformat}
> for(int i(userPassword.size()); i >= 0; --i) {
> userPassword[i] = '*';
> }
> {noformat}
> Note that we cannot use the variable size because it gets modified and thus does not represent the whole password size at that point.
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