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Reading Your Logs Pays Off
Chas Tomlin, a sysadmin and programmer for the University of Southampton noticed some odd entries in his web logs and forwarded it to the ISC for analysis. Examination showed that an attack based on the do_brk exploit ( http://secunia.com/advisories/10328/ ) was attempted and failed. Systems shown to be vulnerable to this attack have the following kernels: 2.4.20-18.9 as shipped with RedHat 9.0 2.4.22 (vanilla) 2.4.22 with grsecurity patch Please make sure your systems are patched and/or upgraded as needed. Another eBay Phishing Scam Anthony Congiano a helpdesk administrator alerted the ISC earlier today to another attempt at Phishing information from eBay users. The e-mail in question tells the recipient that their account has been used "to make fake bids" and "you are required to verify your eBay account by following the link below." The scam is designed to collect E-Bay member names, user names, passwords and credit card information. eBay, and the web host have been notified. Port 135 Spikes, Lovgate and Welchia The traffic pattern on port 135(TCP) noted in yesterday's diary entry continues today but appears to have diminished in intensity. Packet captures in affected areas have shown an RPC DCOM attack which is one of the vectors for infection for the new Lovgate and Welchia variants identified yesterday. There are additional methods of infection for both worms. Fixes for vulnerabilities exploited by Welchia and Lovgate have been made available in 2003. Multiple worms and bots are currently scanning for these vulnerabilities. Lovgate McAfee: http://vil.nai.com/vil/content/v_101157.htm Symantec: http://securityresponse.symantec.com/avcenter/venc/data/w32.lovgate.r@mm.html Welchia Trend Micro: http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_NACHI.K Sasser Sasser also seems to be slowing down as systems are patched and anti-virus updates are applied. For some interesting reading on Sasser's effects, look at these pages: http://www.foxnews.com/story/0,2933,118959,00.html http://news.bbc.co.uk/2/hi/technology/3682537.stm Further Reading If you are not familiar with egress filtering, take a look at SANS instructor Chris Brenton's paper on the subject at: http://www.sans.org/rr/papers/index.php?id=1059 and find out how you can make your network less appealing to would-be attackers. ------- Chris Carboni - chris.carboni_at_verizon.net |
Chris 140 Posts |
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May 7th 2004 1 decade ago |
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