TippingPoint detection bypass

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The following advisory is also available in PDF format for download at: http://www.cybsec.com/vuln/CYBSEC-SecurityPre-Advisory3ComTippingPointIPSDetectionBypass2.pdf CYBSEC S.A. www.cybsec.com Pre-Advisory Name: TippingPoint detection bypass...

IPv6 fragments bypass in nf_conntrack netfilter code

nfconntrack in netfilter in the Linux kernel before 2.6.20.3 does not set nfctinfo during reassembly of fragmented packets, which leaves the default value as IPCTESTABLISHED and might allow remote attackers to bypass certain rulesets using IPv6 fragments...

Linux Kernel Netfilter nf_conntrack IPv6报文重组绕过规则漏洞

Linux Kernel是开放源码操作系统Linux所使用的内核。 Linux Kernel中netfilter的模块实现上存在漏洞，远程攻击者可能利用此漏洞绕过访问过滤。 netfilter的nfconntrack函数在重组碎片IPv6报文期间没有设置nfctinfo，将默认值初始化为0，而这是IPCTESTABLISHED的值，因此所有IPv6碎片都追踪为ESTABLISHED，这样攻击者就可以绕过某些接受ESTABLISHED报文的规则组。 Linux kernel 2.6.20.3 目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：...

Sun Solaris IP实现远程拒绝服务漏洞

Solaris是一款由Sun开发和维护的商业性质UNIX操作系统。 Solaris 8/9的IP实现上存在安全漏洞，远程非特权用户可能利用此漏洞通过发送特制IP报文降低联网Solaris系统的性能。 Solaris系统上可见大量的伪造IP碎片和/或大量的IP碎片重组失败。例如，运行以下命令： % /usr/bin/netstat -s | /usr/bin/egrep 'ReasmDuplicates|ReasmFails' 可能显示很高的ipv6ReasmDuplicates和ipv6ReasmFails计数器值。 此外，单处理器的Solaris...

CVE-2007-1497

nfconntrack in netfilter in the Linux kernel before 2.6.20.3 does not set nfctinfo during reassembly of fragmented packets, which leaves the default value as IPCTESTABLISHED and might allow remote attackers to bypass certain rulesets using IPv6 fragments...

CVE-2007-1497

nfconntrack in netfilter in the Linux kernel before 2.6.20.3 does not set nfctinfo during reassembly of fragmented packets, which leaves the default value as IPCTESTABLISHED and might allow remote attackers to bypass certain rulesets using IPv6 fragments...

Design/Logic Flaw

nfconntrack in netfilter in the Linux kernel before 2.6.20.3 does not set nfctinfo during reassembly of fragmented packets, which leaves the default value as IPCTESTABLISHED and might allow remote attackers to bypass certain rulesets using IPv6 fragments...

CVE-2007-1497

nfconntrack in netfilter in the Linux kernel before 2.6.20.3 does not set nfctinfo during reassembly of fragmented packets, which leaves the default value as IPCTESTABLISHED and might allow remote attackers to bypass certain rulesets using IPv6 fragments...

Snort Inline模式碎片重组拒绝服务漏洞

Snort是广泛部署的开放源码网络入侵检测系统（IDS）。很多其他IDS产品中也使用了Snort及其组件。 Snort Inline在处理畸形的碎片报文时存在漏洞，远程攻击者可能利用此漏洞导致Snort崩溃。 如果在Linux平台上以Inline模式运行Snort的话，且启用了Frag3同时禁用了ipconntrack，则如果向Snort发送了特制的碎片报文的话就会导致拒绝服务。 Snort Project Snort 2.7.0 beta 1 Snort Project Snort 2.6.1.2 Snort Project Snort 2.6.1.1...

snort packets reassembly DoS

Invalid packets reassembly on connection tracking causes application to crash...

snort-dos.txt

/ DOS Snort Inline Affected Versions: 2.6.1.1, 2.6.1.2, 2.7.0beta Requirements : Frag3 Enabled, Inline, Linux, ipconntrack disabled Antimatt3r [email protected] Offset needs to be supplied that would cause reassembly for different snort fragmentation reassembly policies. Since the first packet...

FreeBSD : snort -- DCE/RPC preprocessor vulnerability (afdf500f-c1f6-11db-95c5-000c6ec775d9)

A IBM Internet Security Systems Protection Advisory reports : Snort is vulnerable to a stack-based buffer overflow as a result of DCE/RPC reassembly. This vulnerability is in a dynamic-preprocessor enabled in the default configuration, and the configuration for this preprocessor allows for...

Kaspersky Antivirus content filtering protection bypass

Small reassembly timeout during stateful filtering allows filtering bypass by breaking stream with pauses...

CVE-2006-0839

The frag3 preprocessor in Sourcefire Snort 2.4.3 does not properly reassemble certain fragmented packets with IP options, which allows remote attackers to evade detection of certain attacks, possibly related to IP option lengths...

honeyd security advisory: remote detection

Honeyd Security Advisory 2006-001 ================================= Topic: Remote Detection Via Multiple Probe Packets Version: All versions prior to Honeyd 1.5 Severity: Identification of Honeyd installations allows an adversary to launch attacks specifically against Honeyd. No remote root explo...

Using timing attacks to bypass intrusion detection

It's possible to use difference in timing, for example packet reasembly timeouts, of target system and IDS to bypass detection. As workaround, timing parameters of IDS should be configured to match timing parameters of protected system...

CVE-2005-3242

Ethereal 0.10.12 and earlier allows remote attackers to cause a denial of service crash via unknown vectors in 1 the IrDA dissector and 2 the SMB dissector when SMB transaction payload reassembly is enabled...

security flaw

Ethereal 0.10.12 and earlier allows remote attackers to cause a denial of service crash via unknown vectors in 1 the IrDA dissector and 2 the SMB dissector when SMB transaction payload reassembly is enabled...

PT-2005-4056 · Ethereal +1 · Ethereal +1

Name of the Vulnerable Software and Affected Versions: Ethereal versions 0.10.12 and earlier Description: The issue allows remote attackers to cause a denial of service, resulting in a crash, via unknown vectors in the IrDA dissector and the SMB dissector when SMB transaction payload reassembly i...

security flaw

Netfilter in the Linux kernel 2.6.8.1 allows local users to cause a denial of service memory consumption via certain packet fragments that are reassembled twice, which causes a data structure to be allocated twice...