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Gentoo FoundationGLSA-200409-04

HistorySep 02, 2004 - 12:00 a.m.

Squid: Denial of service when using NTLM authentication

2004-09-0200:00:00

Gentoo Foundation

security.gentoo.org

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.036 Low

EPSS

Percentile

91.5%

JSON

Background

Squid is a full-featured Web Proxy Cache designed to run on Unix systems. It supports proxying and caching of HTTP, FTP, and other URLs, as well as SSL support, cache hierarchies, transparent caching, access control lists and many other features.

Description

Squid 2.5.x versions contain a bug in the functions ntlm_fetch_string() and ntlm_get_string() which lack checking the int32_t offset “o” for negative values.

Impact

A remote attacker could cause a denial of service situation by sending certain malformed NTLMSSP packets if NTLM authentication is enabled.

Workaround

Disable NTLM authentication by removing any “auth_param ntlm program …” directives from squid.conf or use ntlm_auth from Samba-3.x.

Resolution

All Squid users should upgrade to the latest stable version:

 # emerge sync
 
 # emerge -pv "&gt;=net-www/squid-2.5.6-r2"
 # emerge "&gt;=net-www/squid-2.5.6-r2"

OSVersionArchitecturePackageVersionFilename
Gentooanyallnet-proxy/squid<= 2.5.6-r1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
Gentoo	any	all	net-proxy/squid	<= 2.5.6-r1	UNKNOWN

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.036 Low

EPSS

Percentile

91.5%

JSON

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