Bug 21373 – libpcap buffer overflow

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Bug 21373 - libpcap buffer overflow

Summary:	libpcap buffer overflow

Status:	CLOSED RAWHIDE

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	tcpdump (Show other bugs)
Sub Component:
Version:	6.2
Hardware:	i386 Linux

Priority	low Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Harald Hoyer
QA Contact:
Docs Contact:

URL:
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Keywords:	Security

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2000-11-27 07:54 EST by Jarno Huuskonen
Modified:	2008-05-01 11:37 EDT (History)
CC List:	1 user (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2000-11-27 11:07:39 EST
Type:	---
Regression:	---
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Documentation:	---
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RHEL 7.3 requirements from Atomic Host:
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Attachments	(Terms of Use)
Patch to fix libpcap strcpy(ifr.ifr_name, device) overflow (1.62 KB, patch) 2000-11-27 07:55 EST, Jarno Huuskonen	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Jarno Huuskonen 2000-11-27 07:54:18 EST

Libpcap has a buffer overflow. Libpcap uses strcpy to copy a 
device (interface-name) to ifreq.ifr_name (16-byte buffer).
The buffer can be overflowed if the program using libpcap passes
userdefined 'device' to pcap_open_live.
Test: tcpdump -i `perl -e "print 'A'x1000"`

This is not big problem unless someone has made a setuid libpcap program.

I'm attaching a patch that seems to fix this.

(Also it looks like might pcap-dlpi.c suffers from similar problem).

Comment 1 Jarno Huuskonen 2000-11-27 07:55:50 EST

Created attachment 5731 [details]
Patch to fix libpcap strcpy(ifr.ifr_name, device) overflow

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