Bug 142969

Summary: kernel denial of service vulnerability and exploit
Product: Red Hat Enterprise Linux 3 Reporter: Wim Vereecken <wim.vereecken>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED DUPLICATE QA Contact: Brian Brock <bbrock>
Severity: high Docs Contact:
Priority: medium    
Version: 3.0CC: mjc, petrides, pfrields, riel
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2004-12-15 16:53:13 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Wim Vereecken 2004-12-15 15:11:24 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; X11; Linux i686) Opera 
7.23  [en]

Description of problem:
Crash binary (44 bytes) for the Linux kernel 2.4.21-20.EL and 
probably earlier versions, freezing the complete system, even when 
executed without root privileges.



Version-Release number of selected component (if applicable):
2.4.21-20.EL (Red Hat Enterprise Linux AS release 3 / Taroon Update 
3)

How reproducible:
Always

Steps to Reproduce:
1.wget http://www.esat.kuleuven.ac.be/~wvereeck/kernel/exploit
2.chmod 755 exploit
3../exploit (as non-root)
4.freeze and cook up an excuse for your sysadmins
    

Actual Results:  The system freezes, so nothing world-astonishing 
happens.

Expected Results:  No crash/freeze, there are other OS's for this.

Additional info:

There seems to be a problem with the e_phnum byte in the ELF header,
which crashes the linker/kernel, when it holds a zero.
Comment 1 Suzanne Hillman 2004-12-15 16:20:27 UTC 
*** Bug 142971 has been marked as a duplicate of this bug. ***
Comment 2 Mark J. Cox 2004-12-15 16:53:13 UTC 

*** This bug has been marked as a duplicate of 142965 ***