DSA-1605-1

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    DSA-1605-1

    Published: 8 Jul 2008Last Modified: 4 Jul 2022

    Summary: glibc - DNS cache poisoning

    Details: Dan Kaminsky discovered that properties inherent to the DNS protocol lead to practical DNS spoofing and cache poisoning attacks. Among other things, successful attacks can lead to misdirected web traffic and email rerouting. At this time, it is not possible to implement the recommended countermeasures in the GNU libc stub resolver. The following workarounds are available: 1. Install a local BIND 9 resolver on the host, possibly in forward-only mode. BIND 9 will then use source port randomization when sending queries over the network. (Other caching resolvers can be used instead.) 2. Rely on IP address spoofing protection if available. Successful attacks must spoof the address of one of the resolvers, which may not be possible if the network is guarded properly against IP spoofing attacks (both from internal and external sources). This DSA will be updated when patches for hardening the stub resolver are available.

    References:

    Affected packages

    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