SecurityTracker.com Archives - (Debian Issues Fix) Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

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Category: OS (Linux) > Linux Kernel

Vendors: kernel.org

(Debian Issues Fix) Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

SecurityTracker Alert ID: 1009113

CVE Reference: CAN-2004-0077 (Links to External Site)

Date: Feb 18 2004

Impact: Execution of arbitrary code via local system, Root access via local system

Fix Available: Yes Vendor Confirmed: Yes

Version(s): Debian 3.0

Description: Another vulnerability was reported in the Linux kernel do_mremap() function. A local user can execute arbitrary code with root privileges.

Paul Starzetz discovered and reported that there is a missing return value check within the mremap(2) system call.

When resizing or moving virtual memory areas, the function reportedly does not test the return value of the do_munmap() function. Cases where the function fails (for example, due to the number of virtual memory areas being exceeded by the calling process) will not be properly detected, according to the report. As a result, the kernel may move memory belonging to one process into memory space that is allocated to another process.

Some other calls to the do_munmap() function are also not checked, the report said.

A local user can gain root privileges on the target system.

The original advisory is available at:

http://isec.pl/vulnerabilities/isec-0014-mremap-unmap.txt

Impact: A local user can gain root privileges on the target system.

Vendor URL: www.kernel.org/ (Links to External Site)

Cause: Boundary error

Underlying OS: Linux (Debian)

Reported By: joey@infodrom.org (Martin Schulze)

Message History: This archive entry is a follow-up to the message listed below.

Feb 18 2004

Linux Kernel do_mremap() Fails to Check do_munmap() Return Values, Allowing a Local User to Gain Root Privileges

Source Message Contents

Date: Wed, 18 Feb 2004 14:52:06 +0100 (CET)
From: joey@infodrom.org (Martin Schulze)
Subject: [SECURITY] [DSA 439-1] New Linux 2.4.16 packages fix several local root exploits (arm)

 

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 439-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
February 18th, 2004                     http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : kernel-image-2.4.16-lart, kernel-image-2.4.16-netwinder,  kernel-image-2.4.16-riscpc
, kernel-patch-2.4.16-arm
Vulnerability  : several vulnerabilities
Problem-Type   : local
Debian-specific: no
CVE ID         : CAN-2003-0961 CAN-2003-0985 CAN-2004-0077

Several local root exploits have been discovered recently in the Linux
kernel.  This security advisory updates the PowerPC/Apus kernel for
Debian GNU/Linux.  The Common Vulnerabilities and Exposures project
identifies the following problems that are fixed with this update:

CAN-2003-0961:

   An integer overflow in brk() system call (do_brk() function) for
   Linux allows a local attacker to gain root privileges.  Fixed
   upstream in Linux 2.4.23.

CAN-2003-0985:

   Paul Starzetz discovered a flaw in bounds checking in mremap() in
   the Linux kernel (present in version 2.4.x and 2.6.x) which may
   allow a local attacker to gain root privileges.  Version 2.2 is not
   affected by this bug.  Fixed upstream in Linux 2.4.24.

CAN-2004-0077:

   Paul Starzetz and Wojciech Purczynski of isec.pl discovered a
   critical security vulnerability in the memory management code of
   Linux inside the mremap(2) system call.  Due to missing function
   return value check of internal functions a local attacker can gain
   root privileges.  Fixed upstream in Linux 2.4.25 and 2.6.3.

For the stable distribution (woody) this problem has been fixed in
version 2.4.26/20040204 of lart, netwinder and riscpc image and in
version 20040204 of kernel-patch-2.4.16-arm.

Other architectures will probably mentioned in a separate advisory or
are not affected (m68k).

For the unstable distribution (sid) these problems will be fixed soon.

We recommend that you upgrade your Linux kernel packages immediately.


Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/k/kernel-patch-2.4.16-arm/kernel-patch-2.4.16-arm_20
040204.dsc
      Size/MD5 checksum:      562 7bd0b443e490132da8f26188ca560f75
    http://security.debian.org/pool/updates/main/k/kernel-patch-2.4.16-arm/kernel-patch-2.4.16-arm_20
040204.tar.gz
      Size/MD5 checksum:   579045 853b5f05e03217dfb47f28cf852dca4c

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-lart/kernel-image-2.4.16-lart_
20040204.dsc
      Size/MD5 checksum:      586 e2cb96946739cfffd4327ae1e218a982
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-lart/kernel-image-2.4.16-lart_
20040204.tar.gz
      Size/MD5 checksum:    16443 9b5b8c8311cc6ba23abc2e121882281a

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-netwinder/kernel-image-2.4.16-
netwinder_20040204.dsc
      Size/MD5 checksum:      624 d2258e373574684da142a45ecfc4312f
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-netwinder/kernel-image-2.4.16-
netwinder_20040204.tar.gz
      Size/MD5 checksum:    21783 fc07fb8db829045ef9a8ee6881e1af48

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-riscpc/kernel-image-2.4.16-ris
cpc_20040204.dsc
      Size/MD5 checksum:      592 f2252946f185d1c52796a68a1d442cb0
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-riscpc/kernel-image-2.4.16-ris
cpc_20040204.tar.gz
      Size/MD5 checksum:    19104 144bfd5b87a5daccf879049334b24bcd

  Architecture independent components:

    http://security.debian.org/pool/updates/main/k/kernel-patch-2.4.16-arm/kernel-patch-2.4.16-arm_20
040204_all.deb
      Size/MD5 checksum:   583148 6a4951879008cc3d882d6a30112d0cbc

  ARM architecture:

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-lart/kernel-image-2.4.16-lart_
20040204_arm.deb
      Size/MD5 checksum:   717092 eb20d52fed79cfe95981f1838bc38e0c

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-netwinder/kernel-headers-2.4.1
6_20040204_arm.deb
      Size/MD5 checksum:  3421140 3e0dfbdcb48437ab733d43c92deb0157
    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-netwinder/kernel-image-2.4.16-
netwinder_20040204_arm.deb
      Size/MD5 checksum:  6671136 72f1f771e847c593e83179b6dbda4074

    http://security.debian.org/pool/updates/main/k/kernel-image-2.4.16-riscpc/kernel-image-2.4.16-ris
cpc_20040204_arm.deb
      Size/MD5 checksum:  2910348 c4fab31d10a137738aeb722eb7358488


  These files will probably be moved into the stable distribution on
  its next revision.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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