Bug 191300 – CVE-2005-4798 nfs client: handle long symlinks properly

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Bug 191300 - CVE-2005-4798 nfs client: handle long symlinks properly

Summary:	CVE-2005-4798 nfs client: handle long symlinks properly

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Enterprise Linux 2.1
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	2.1
Hardware:	ia64 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Don Howard
QA Contact:	Brian Brock
Docs Contact:

URL:
Whiteboard:	impact=moderate,source=bugzilla,repor...
Keywords:	Security

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2006-05-10 12:48 EDT by Marcel Holtmann
Modified:	2007-11-30 17:06 EST (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2006-05-12 14:00:45 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Marcel Holtmann 2006-05-10 12:48:15 EDT

Buffer overflow in NFS readlink handling in the Linux Kernel 2.4 up to 2.4.31
allows remote NFS servers to cause a denial of service via a long symlink.

More detailed description can be found in bug 169230.

Comment 1 Don Howard 2006-05-12 14:00:45 EDT

It looks like rhel2 gets this right:


        strlen = (u32*)res->buffer;
        /* Convert length of symlink */
        len = ntohl(*strlen);
        if (len > res->bufsiz - 5)
                len = res->bufsiz - 5;
        *strlen = len;
        /* NULL terminate the string we got */
        string = (char *)(strlen + 1);
        string[len] = 0;

(nfs2/3 on pensacola and derry are all similar)

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