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Fedora: kernel Privilege escalation vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
Fedora Paul Starzetz discovered a flaw in bounds checking in mremap() in the Linux kernel versions 2.4.23 and previous which may allow a local attacker to gain root privileges.

---------------------------------------------------------------------
Fedora Update Notification
FEDORA-2003-046
2004-01-05
---------------------------------------------------------------------

Name        : kernel
Version     : 2.4.22                      
Release     : 1.2138.nptl                  
Summary     : The Linux kernel (the core of the Linux operating system)
Description :
The kernel package contains the Linux kernel (vmlinuz), the core of your
Red Hat Linux operating system.  The kernel handles the basic functions
of the operating system:  memory allocation, process allocation, device
input and output, etc.

Paul Starzetz discovered a flaw in bounds checking in mremap() in the Linux
kernel versions 2.4.23 and previous which may allow a local attacker to
gain root privileges.  No exploit is currently available; however, it is
believed that this issue is exploitable (although not trivially.) The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2003-0985 to this issue.

All users are advised to upgrade to these errata packages, which contain a
backported security patch that corrects this issue.  

Red Hat would like to thank Paul Starzetz from ISEC for disclosing this
issue as well as Andrea Arcangeli and Solar Designer for working on the patch.

These packages also contain a fix for a minor information leak in the real
time clock (rtc) routines. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2003-0984 to this issue.

---------------------------------------------------------------------


* Wed Dec 24 2003 Dave Jones <davej@redhat.com>
- Fix mremap corner case.

* Tue Dec 23 2003 Dave Jones <davej@redhat.com>
- Numerous USB fixes (#110307, #90442, #107929, #110872)

* Tue Dec 16 2003 Dave Jones <davej@redhat.com>
- Fix leak in CDROM IOCTL. (#112249)


---------------------------------------------------------------------
This update can be downloaded from:
   http://download.fedora.redhat.com/pub/fedora/linux/core/updates/1/

c9a94fe6d6a3cffb2604a17bf42839e2  SRPMS/kernel-2.4.22-1.2138.nptl.src.rpm
841d46869237a9acce1c5e667e13807e  i386/kernel-source-2.4.22-1.2138.nptl.i386.rpm
ad2e530db065ddc5cceef49ff825d606  i386/kernel-doc-2.4.22-1.2138.nptl.i386.rpm
ed345bd737557d25437d8a06ff10c6ed  i386/kernel-BOOT-2.4.22-1.2138.nptl.i386.rpm
bc4dab2573386726679014c6fa2eb059  i386/debug/kernel-debuginfo-2.4.22-1.2138.nptl.i386.rpm
88bb242a1d86c54674c8be1b2a5d918e  i386/kernel-2.4.22-1.2138.nptl.i586.rpm
e5f61174a8586eb7487453dae7ea1875  i386/debug/kernel-debuginfo-2.4.22-1.2138.nptl.i586.rpm
ee7ac4ffefdfa5ceff18e10d9c5b776b  i386/kernel-2.4.22-1.2138.nptl.i686.rpm
50a7aabcbb8642c878714e3c58a49dff  i386/kernel-smp-2.4.22-1.2138.nptl.i686.rpm
fdd33ad20548d78295e59a3d3c7d1f5b  i386/debug/kernel-debuginfo-2.4.22-1.2138.nptl.i686.rpm
8b6ee386df3bcb68dd1c149c91f677e5  i386/kernel-2.4.22-1.2138.nptl.athlon.rpm
01af9cea1186fefc4e844c4d78cc7a06  i386/kernel-smp-2.4.22-1.2138.nptl.athlon.rpm
01592b67d16d33f577c4de864f3799e5  i386/debug/kernel-debuginfo-2.4.22-1.2138.nptl.athlon.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.
---------------------------------------------------------------------

References: 
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0985 
http://isec.pl/vulnerabilities/isec-0013-mremap.txt

 
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