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As a quick test I used the installer of Total Commander, which is signed by a party that is acceptable by default to , the API to be used for signature verification.
The test was successful, it seems that OSCE only cares about the signedness of the updates but not the signer.
Other exploit vectors based (partially) on these findings are also possible, the software is big and I haven’t looked at most of it yet.
I notified the vendor about the first infoleak on 3 January 2014.
The only problematic part is the IP parameter that seems to contain a hash value. You can use scripts like Find Crypt to find the MD5 routine in the [jdk Notify] error=-1471291287,clinet=472bc675-3862-4e9d-9890-e3b14d4ddc3e,server=SEQ=80&DELAY=0&USEPROXY=0&PROXY=&PROXYPORT=0&PROXYLOGIN=&PROXYPWD=&SERVER=192.168.124.134&SERVERPORT=8080cc NT_Version=10.6&Pcc95_Version=10.6&Engine NT_Version=9.700.1001&Engine95_Version=&ptch Hotfix Date=20131228153813&PTNFILE=1050100&ROLLBACK=1050100&MESSAGE=20&TIME=201312281648170406&DIRECT_UPDATE=1, return -1293342568 (sic!
) parameter, that is the GUID of the client generated at install time.
Since this software looked quite complex (big attack surface) I decided to take a closer look at it.
After installing a trial version (10.6 SP1) I could already tell that this software will worth the effort: And there are possibly many other fragile parts of the system.
With another infoleak it might be possible to improve the attack to be CVSS 10.0.Analyzing the security of security software is one of my favorite research areas: it is always ironic to see software originally meant to protect your systems open a gaping door for the attackers.Earlier this year I stumbled upon the Office Scan security suite by Trend Micro, a probably lesser known host protection solution (AV) still used at some interesting networks.MD5 can be effectively brute-forced, so this is definitely bad, not to mention that the proxy password can be retrieved in plain text.But this is not really high impact, so I dug further.