CVE-2019-12527 - An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHea

CVE-2019-12527

Summary

An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. Squid does not check that the decoded length isn't greater than the buffer, leading to a heap-based buffer overflow with user controlled data.

References

Vulnerable Configurations

cpe:2.3:a:squid-cache:squid:4.0.23:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.0.23:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.0.24:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.0.24:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.0.25:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.0.25:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.3:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.3:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.4:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.4:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.6:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.6:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.7:*:*:*:*:*:*:*
cpe:2.3:a:squid-cache:squid:4.7:*:*:*:*:*:*:*

CVSS

Base:	6.8 (as of 24-08-2020 - 17:37)
Impact:
Exploitability:

CWE

CWE-787

CAPEC

Access

Vector	Complexity	Authentication
NETWORK	MEDIUM	NONE

Impact

Confidentiality	Integrity	Availability
PARTIAL	PARTIAL	PARTIAL

cvss-vector via4

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

redhat via4

advisories

bugzilla

id	1730533
title	CVE-2019-12527 squid: heap-based buffer overflow in HttpHeader::getAuth

oval

comment Red Hat Enterprise Linux must be installed
oval oval:com.redhat.rhba:tst:20070304026

AND

comment Red Hat Enterprise Linux 8 is installed
oval oval:com.redhat.rhba:tst:20193384074
comment Module squid:4 is enabled
oval oval:com.redhat.rhsa:tst:20192593011

AND

comment libecap is earlier than 0:1.0.1-2.module+el8.0.0+4045+70edde92
oval oval:com.redhat.rhsa:tst:20192593001
comment libecap is signed with Red Hat redhatrelease2 key
oval oval:com.redhat.rhsa:tst:20192593002

AND

comment libecap-debugsource is earlier than 0:1.0.1-2.module+el8.0.0+4045+70edde92
oval oval:com.redhat.rhsa:tst:20192593003
comment libecap-debugsource is signed with Red Hat redhatrelease2 key
oval oval:com.redhat.rhsa:tst:20192593004

AND

comment libecap-devel is earlier than 0:1.0.1-2.module+el8.0.0+4045+70edde92
oval oval:com.redhat.rhsa:tst:20192593005
comment libecap-devel is signed with Red Hat redhatrelease2 key
oval oval:com.redhat.rhsa:tst:20192593006

AND

comment squid is earlier than 7:4.4-5.module+el8.0.0+4045+70edde92
oval oval:com.redhat.rhsa:tst:20192593007
comment squid is signed with Red Hat redhatrelease2 key
oval oval:com.redhat.rhsa:tst:20110545002

AND

comment squid-debugsource is earlier than 7:4.4-5.module+el8.0.0+4045+70edde92
oval oval:com.redhat.rhsa:tst:20192593009
comment squid-debugsource is signed with Red Hat redhatrelease2 key
oval oval:com.redhat.rhsa:tst:20192593010

rhsa

id	RHSA-2019:2593
released	2019-09-03
severity	Important
title	RHSA-2019:2593: squid:4 security update (Important)

rpms

libecap-0:1.0.1-2.module+el8.0.0+4045+70edde92
libecap-debuginfo-0:1.0.1-2.module+el8.0.0+4045+70edde92
libecap-debugsource-0:1.0.1-2.module+el8.0.0+4045+70edde92
libecap-devel-0:1.0.1-2.module+el8.0.0+4045+70edde92
squid-7:4.4-5.module+el8.0.0+4045+70edde92
squid-debuginfo-7:4.4-5.module+el8.0.0+4045+70edde92
squid-debugsource-7:4.4-5.module+el8.0.0+4045+70edde92

refmap via4

bid	109143
bugtraq	20190825 [SECURITY] [DSA 4507-1] squid security update
confirm	http://www.squid-cache.org/Versions/v4/changesets/ http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch https://github.com/squid-cache/squid/commits/v4
debian	DSA-4507
fedora	FEDORA-2019-cb50bcc189
suse	openSUSE-SU-2019:2540 openSUSE-SU-2019:2541
ubuntu	USN-4065-1

Last major update

24-08-2020 - 17:37

Published

11-07-2019 - 19:15

Last modified

24-08-2020 - 17:37