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Slackware Security Advisory: glibc 2.2 local vulnerability on setuid binaries

Jan 12, 2001, 20:34 (0 Talkback[s])

Date: Wed, 10 Jan 2001 20:29:57 -0800
From: Slackware Security Team security@slackware.com
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [slackware-security] glibc 2.2 local vulnerability on setuid binaries

glibc-2.2 contains a local vulnerability that affects all setuid root binaries. Any user on affected systems will be able to read any file on the system through a simple process: The user sets the RESOLV_HOST_CONF environment variable to the name of the file that they wish to read, then runs any setuid root program that makes use of that variable. The file is then written to stderr.

The original BugTraq announcement can be read at the following URL:

http://www.securityfocus.com/archive/1/155352

Users of Slackware -current are strongly urged to upgrade to the new glibc packages in the -current branch.


glibc 2.2 AVAILABLE - (a1/glibcso.tgz, d1/glibc.tgz)
PACKAGE INFORMATION:
a1/glibcso.tgz:
This package contains the runtime libraries for glibc 2.2 All users of Slackware -current should upgrade this package.

d1/glibc.tgz:
This is the full glibc 2.2 package, complete with headers and static libraries. If you had previously installed this package, you need to upgrade it.


WHERE TO FIND THE NEW PACKAGES:
All new packages can be found in the -current branch:

ftp://ftp.slackware.com/pub/slackware/slackware-current/slakware/a1/glibcso.tgz
ftp://ftp.slackware.com/pub/slackware/slackware-current/slakware/d1/glibc.tgz


MD5 SIGNATURES AND CHECKSUMS:
Here are the md5sums and checksums for the packages:
   16-bit "sum" checksum:
   39060  1054   a1/glibcso.tgz
   61562 26779   d1/glibc.tgz

   128-bit MD5 message digest:
6ea2e3fecf1a1a970f1e37b7be7c12aa a1/glibcso.tgz
4f1e8ef903f1d0dd675aaf0cc3926177 d1/glibc.tgz

INSTALLATION INSTRUCTIONS:
It is recommended that the two packages above be upgraded in single user mode (runlevel 1). Bring the system into runlevel 1:

# telinit 1

Then upgrade the packages:

# upgradepkg .tgz

Then bring the system back into multiuser mode:

# telinit 3

Remember, it's also a good idea to backup configuration files before upgrading packages.

- Slackware Linux Security Team
http://www.slackware.com