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    CVE-2006-1242

    The ip_push_pending_frames function in Linux 2.4.x and 2.6.x before 2.6.16 increments the IP ID field when sending a RST after receiving unsolicited TCP SYN-ACK packets, which allows remote attackers to conduct an Idle Scan (nmap -sI) attack, which bypasses intended protections against such attacks.

    Published:Mar 14, 2006
    Last Modified:Apr 16, 2026
    EPS:Mar 15, 2006
    EPSS Score:0.0304
    CVSS Score:5

    Affected Products

    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://secunia.com/advisories/19402
    http://secunia.com/advisories/19955
    http://secunia.com/advisories/20157
    http://secunia.com/advisories/20398
    http://secunia.com/advisories/20671
    http://secunia.com/advisories/20914
    http://secunia.com/advisories/21136
    http://secunia.com/advisories/21465
    http://secunia.com/advisories/21983
    http://secunia.com/advisories/22417
    http://support.avaya.com/elmodocs2/security/ASA-2006-180.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
    http://www.debian.org/security/2006/dsa-1097
    http://www.debian.org/security/2006/dsa-1103
    http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.1
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:086
    http://www.novell.com/linux/security/advisories/2006-05-31.html
    http://www.redhat.com/support/errata/RHSA-2006-0437.html
    http://www.redhat.com/support/errata/RHSA-2006-0575.html
    http://www.securityfocus.com/archive/1/427622/100/0/threaded
    http://www.securityfocus.com/archive/1/427753/100/0/threaded
    http://www.securityfocus.com/archive/1/427893/100/0/threaded
    http://www.securityfocus.com/archive/1/428605/30/6210/threaded
    http://www.securityfocus.com/bid/17109
    http://www.vupen.com/english/advisories/2006/1140
    http://www.vupen.com/english/advisories/2006/2554
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10317
    https://usn.ubuntu.com/281-1/
    http://secunia.com/advisories/19402
    http://secunia.com/advisories/19955
    http://secunia.com/advisories/20157
    http://secunia.com/advisories/20398
    http://secunia.com/advisories/20671
    http://secunia.com/advisories/20914
    http://secunia.com/advisories/21136
    http://secunia.com/advisories/21465
    http://secunia.com/advisories/21983
    http://secunia.com/advisories/22417
    http://support.avaya.com/elmodocs2/security/ASA-2006-180.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
    http://www.debian.org/security/2006/dsa-1097
    http://www.debian.org/security/2006/dsa-1103
    http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.1
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:086
    http://www.novell.com/linux/security/advisories/2006-05-31.html
    http://www.redhat.com/support/errata/RHSA-2006-0437.html
    http://www.redhat.com/support/errata/RHSA-2006-0575.html
    http://www.securityfocus.com/archive/1/427622/100/0/threaded
    http://www.securityfocus.com/archive/1/427753/100/0/threaded
    http://www.securityfocus.com/archive/1/427893/100/0/threaded
    http://www.securityfocus.com/archive/1/428605/30/6210/threaded
    http://www.securityfocus.com/bid/17109
    http://www.vupen.com/english/advisories/2006/1140
    http://www.vupen.com/english/advisories/2006/2554
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10317
    https://usn.ubuntu.com/281-1/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High