Claymore Dual GPU Miner 10.5 Format String

2018.02.03
Credit: res1n
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-134

Claymore Dual Gpu Miner <= 10.5 Format Strings Vulnerability ======================================================================= product: Claymore's Dual Miner vulnerable version: <= 10.5 fixed version: 10.6 CVE number: - CVE-2018a6317 impact: critical homepage: https://bitcointalk.org/index.php?topic=1433925.0 found: 2018-01-26 by: twitter.com/res1n ======================================================================= Vulnerability overview/description: ----------------------------------- Claymoreas Dual GPU Miner 10.5 and below is vulnerable to a format strings vulnerability. This allows an unauthenticated remote attacker to read memory addresses, or immediately terminate the mining process causing a denial of service. 1) By sending a custom request to the json api on port 3333 of the remote management service it's possible to leak stack addresses and possibly rewrite stack addresses with %p. I wasn't able to break out of the json padding but someone else may be able to as %s also dumps string contents. example - echo -e '{"id":1,"jsonrpc":"1.0","method":"%x %x %x %x"}' | nc 192.168.1.139 3333 & printf "\n". 2) Sending %n to the json api on port 3333 immediately kills the mining process. example - echo -e '{"id":1,"jsonrpc":"1.0","method":"%n"}' | nc 192.168.1.139 3333 & printf "\n". Solution ------------------------ Upgrade to version 10.6 Vendor contact timeline: ------------------------ 01/26/18aaaReported to dev 01/26/18 a Confirmed and immediately patched. 10.6 released request for 3a4 day embargo 01/31/18aaaPublic Disclosure Writeup - https://medium.com/secjuice/claymore-dual-gpu-miner-10-5-format-strings-vulnerability-916ab3d2db30

References:

https://medium.com/secjuice/claymore-dual-gpu-miner-10-5-format-strings-vulnerability-916ab3d2db30


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