Mandrake Linux Advisory: bind
Nov 14, 2002, 20:24 (0 Talkback[s])
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Mandrake Linux Security Update Advisory
Package name: bind
Advisory ID: MDKSA-2002:077
Date: November 14th, 2002
Affected versions: 7.2, Single Network Firewall 7.2
Several vulnerabilities were discovered in the BIND8 DNS server by ISS
(Internet Security Services), including a remotely exploitable buffer
overflow. The first vulnerability is how named handles SIG records;
this buffer overflow can be exploited to obtain access to the victim
host with the privilege of the user the named process is running as.
By default, Mandrake Linux is configured to run the named process as
the named user. To successfully exploit this vulnerability, the
attacker must control an existing DNS domain and must be allowed to
perform a recursive query.
A possible work-around is to restrict recursive requests, however
MandrakeSoft encourages all users to upgrade to the provided BIND9
packages. You can also completely disable recursion by adding
"recursion no;" to the options section of /etc/named.conf.
Several Denial of Service problems also exist in BIND8 that allow
attackers to terminate the named process. At least one of these
vulnerabilities seems to be exploitable even when the attacker is
not permitted to perform recursive queries, so the work-around noted
above is not effective against this DoS.
Both problems are not reported to effect BIND9. As Linux-Mandrake
7.2 and Single Network Firewall 7.2 are the only supported distributions
to still ship BIND8, we have elected to upgrade to both a patched
version of BIND8 and BIND9. The BIND8 packages contain the patch
ISC made available late on the 13th, contrary to their original
advisory which called for them to be made available next week. Despite
this, however, MandrakeSoft encourages everyone who is able to upgrade
to BIND9 rather than BIND8.
The MandrakeSoft security team wishes to apologize to MandrakeSoft
customers for not being able to provide timely fixes for this problem,
and regrets the inability of the ISC to work with the Internet community
at large to provide adequate protection to users of BIND.
Single Network Firewall 7.2:
Bug IDs fixed (see https://qa.mandrakesoft.com for more information):
To upgrade automatically, use MandrakeUpdate. The verification of md5
checksums and GPG signatures is performed automatically for you.
If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
FTP mirrors can be obtained from:
Please verify the update prior to upgrading to ensure the integrity of
the downloaded package. You can do this with the command:
rpm --checksig <filename>
All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team from:
Please be aware that sometimes it takes the mirrors a few hours to
You can view other update advisories for Mandrake Linux at:
MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
If you want to report vulnerabilities, please contact
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team