krb4/dietlibc Updates for Debian
Posted on: 03/28/2003 05:22 PM

Two new security updates for Debian GNU/Linux are available:

DSA-273-1 krb4 -- Cryptographic weakness

A cryptographic weakness in version 4 of the Kerberos protocol allows an attacker to use a chosen-plaintext attack to impersonate any principal in a realm. Additional cryptographic weaknesses in the krb4 implementation permit the use of cut-and-paste attacks to fabricate krb4 tickets for unauthorized client principals if triple-DES keys are used to key krb4 services. These attacks can subvert a site's entire Kerberos authentication infrastructure.

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DSA-272-1 dietlibc -- integer overflow

eEye Digital Security discovered an integer overflow in the xdrmem_getbytes() function of glibc, that is also present in dietlibc, a small libc useful especially for small and embedded systems. This function is part of the XDR encoder/decoder derived from Sun's RPC implementation. Depending upon the application, this vulnerability can cause buffer overflows and could possibly be exploited to execute arbitray code.

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