Impact
An integer overflow bug in Redis version 6.0 or newer, could be exploited using the STRALGO LCS command to corrupt the heap and potentially result with remote code execution.
This is a result of an incomplete fix by CVE-2021-29477.
Patches
The problem is fixed in version 6.2.4 and 6.0.14.
Workarounds
An additional workaround to mitigate the problem without patching the redis-server executable is to use ACL configuration to prevent clients from using the STRALGO LCS command.
On 64 bit systems which have the fixes of CVE-2021-29477 (6.2.3 or 6.0.13), it is sufficient to make sure that the proto-max-bulk-len config parameter is smaller than 2GB (default is 512MB).
Credit
This problem has been identified and reported by Nipun Gupta.
For more information
If you have any questions or comments about this advisory:
Impact
An integer overflow bug in Redis version 6.0 or newer, could be exploited using the STRALGO LCS command to corrupt the heap and potentially result with remote code execution.
This is a result of an incomplete fix by CVE-2021-29477.
Patches
The problem is fixed in version 6.2.4 and 6.0.14.
Workarounds
An additional workaround to mitigate the problem without patching the
redis-serverexecutable is to use ACL configuration to prevent clients from using theSTRALGO LCScommand.On 64 bit systems which have the fixes of CVE-2021-29477 (6.2.3 or 6.0.13), it is sufficient to make sure that the
proto-max-bulk-lenconfig parameter is smaller than 2GB (default is 512MB).Credit
This problem has been identified and reported by Nipun Gupta.
For more information
If you have any questions or comments about this advisory: