cURL: NTLM username stack overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200510-19 / cURL
Release Date	October 22, 2005
Latest Revision	October 22, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/curl	< 7.15.0	>= 7.15.0	All supported architectures

Related bugreports: #109097

Synopsis

cURL is vulnerable to a buffer overflow which could lead to the execution of arbitrary code.

2. Impact Information

Background

cURL is a command line tool and library for transferring files via many different protocols. It supports NTLM authentication to retrieve files from Windows-based systems.

Description

iDEFENSE reported that insufficient bounds checking on a memcpy() of the supplied NTLM username can result in a stack overflow.

Impact

A remote attacker could setup a malicious server and entice an user to connect to it using a cURL client, potentially leading to the execution of arbitrary code with the permissions of the user running cURL.

3. Resolution Information

Workaround

Disable NTLM authentication by not using the --anyauth or --ntlm options when using cURL (the command line version). Workarounds for programs that use the cURL library depend on the configuration options presented by those programs.

Resolution

All cURL users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/curl-7.15.0"

4. References

Updated October 22, 2005

Summary: This is a Gentoo Linux Security Advisory

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