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Sicherheit: Sicherheitslücken im Kernel
Aktuelle Meldungen Distributionen
Name: Sicherheitslücken im Kernel
ID: TLSA2001019
Distribution: TurboLinux
Plattformen: Keine Angabe
Datum: Do, 24. Mai 2001, 13:00
Referenzen: Keine Angabe
Applikationen: Linux

Originalnachricht

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Turbolinux Security Announcement

Package: kernel
Vulnerable Packages: All Turbolinux versions previous to 2.2.18-2
Date: 05/18/2001 5:00 PDT


Affected Turbolinux platforms: TL 6.5 Server,
TL 6.1 Workstation,
All Turbolinux versions
6.0.5 and earlier

Turbolinux Advisory ID#: TLSA2001019

Credits: Thanks go to Chris Evans and OpenWall

References: http://www.linux.org.uk/VERSION/relnotes.2219.html
http://www.securityportal.com/topnews/weekly/linux.html


____________________________________________________________________________________________
_

Several security holes have been discovered and fixed in the kernel
packages. Please update the packages in your installation as soon as
possible.
____________________________________________________________________________________________
_

1. Problem Summary

a. Ptrace/execve race condition

An attacker can manipulate a setuid process that uses ptrace,
thereby allowing root access. This problem was thought to have
been fixed in a previous kernel patch, but apparently it was not.

b. Sysctl() Kernel Information Leakage Vulnerability

From the Securityfocus.com advisory, #2364:

The sysctl() call allows a privileged program to read or write
kernel parameters. However, underprivileged programs can utilize
this function call because the call will accept signed values. Hence,
it is possible for an attacker to reach below the threshold memory
address set for system security by supplying negative values. This
would enable him to browse kernel information, potentially giving
him administrative access.

c. binfmt_misc

binfmt_misc touched user pages directly and could be exploited.

d. CPIA driver

An off by one buffer check in the CPIA driver allowed users to
scribble into kernel memory

e. CPUID and MSR drivers

Unloading and reloading these could cause a crash due to missing
unregister calls. Normally not exploitable but if set to autoload
and unload they could be abused.

f. Classifier

Fix a possible hang in the classifier code.

g. get/setsockopt

Mishandling of sign bits in setsockopt and getsockopt allowed
local DoS and other attacks.

h. SYS5 shared memory

A code path existed where the shm code would scribble on very
recently freed memory. It is not clear that this was actually
exploitable.

i. User access asm bug on x86

Certain obscure constant copies came out copying the wrong number
of bytes. No known exploit or actual problem case is known but it
potentially existed.

j. UDP Deadlock

A local user could deadlock the kernel due to bugs in UDP port
allocation.


2. Solution

Update each package from our ftp server by running the following
command:

rpm -Uvh ftp_path_to_filename

Where ftp_path_to_filename is the following:

Note: Please update the packages in the order listed below:


kernel-BOOT-2.2.18-10.3.i386.rpm
kernel-doc-2.2.18-10.3.i386.rpm
kernel-extramodules-2.2.18-10.i386.rpm
kernel-utils-2.2.18-10.3.i386.rpm
kernel-headers-2.2.18-10.3.i386.rpm
kernel-ibcs-2.2.18-10.3.i386.rpm
kernel-pcmcia-cs-2.2.18-10.3.i386.rpm
kernel-source-2.2.18-10.3.i386.rpm
kernel-smp-2.2.18-10.3.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/kernel-2.2.18-10.3.i386.rpm


The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/kernel-2.2.18-10.3.src.rpm

**Note: You must rebuild and install the RPM if you choose to download
and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE
THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

MD5 sum Package Name
--------------------------------------------------------------------------------------------
-

5b4a4c2ac06a2479a562fca01991fe74 kernel-2.2.18-10.3.i386.rpm
22bc47854607e0d5e04080898178d2e3 kernel-BOOT-2.2.18-10.3.i386.rpm
fe8900046323a73436ec82adb85e2b1a kernel-doc-2.2.18-10.3.i386.rpm
c8acccc7e3c041fb3322be5b92612889 kernel-extramodules-2.2.18-10.i386.rpm
f74efedbf5617a03182431e0156abf66 kernel-headers-2.2.18-10.3.i386.rpm
963d95342008f22f1d2c9047f295e567 kernel-ibcs-2.2.18-10.3.i386.rpm
41e25d4268cf638fbef50df525b117d1 kernel-pcmcia-cs-2.2.18-10.3.i386.rpm
218fe6840a9f6fe068d771bf638f87a2 kernel-smp-2.2.18-10.3.i386.rpm
ae393a256d96ba4ae073952ac23e2e23 kernel-source-2.2.18-10.3.i386.rpm
4b316041c196f7dfc35a7153e16cad2f kernel-utils-2.2.18-10.3.i386.rpm
e6c0d9d0fe7d8372f78c70a265f8f1c9 kernel-2.2.18-10.3.src.rpm

____________________________________________________________________________________________
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These packages are GPG signed by Turbolinux for security. Our key
is available here:

http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

md5sum name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

_______________________________________________________________________________________________
_

You can find more updates on our ftp server:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/

for TL6.x Workstation and Server security updates

Our webpage for security announcements:

http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

security@turbolinux.com
_______________________________________________________________________________________________
_

Subscribe to the Turbolinux Security Mailing lists:

TL-security - A moderated list for discussing security issues
Turbolinux products.
Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

TL-security-announce - An announce-only mailing list for security
updates and alerts.

Subscribe at:

http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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