Bugzilla – Bug 1162691
VUL-0: CVE-2020-8517: squid: Buffer Overflow issue in ext_lm_group_acl helper (SQUID-2020:3)
Last modified: 2023-03-27 08:20:42 UTC
__________________________________________________________________ Squid Proxy Cache Security Update Advisory SQUID-2020:3 __________________________________________________________________ Advisory ID: SQUID-2020:3 Date: February 02, 2020 Summary: Buffer Overflow issue in ext_lm_group_acl helper. Affected versions: Squid 2.x -> 2.7.STABLE9 Squid 3.x -> 3.5.28 Squid 4.x -> 4.9 Fixed in version: Squid 4.10 __________________________________________________________________ http://www.squid-cache.org/Advisories/SQUID-2019_3.txt http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8517 __________________________________________________________________ Problem Description: Due to incorrect buffer management ext_lm_group_acl is vulnerable to a denial of service attack when processing NTLM Authentication credentials. __________________________________________________________________ Severity: This problem is limited to installations using the ext_lm_group_acl binary. Due to incorrect input validation the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections this can result in the the helper process being terminated unexpectedly. Resulting in Squid process also terminating and a denial of service for all clients using the proxy. __________________________________________________________________ Updated Packages: This bug is fixed by ext_lm_group_acl from Squid version 4.10. In addition, patches addressing this problem for the stable releases can be found in our patch archives: Squid 3.5: <http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-c62d2b43ad4962ea44aa0c5edb4cc99cb83a413d.patch> Squid 4: <http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch> If you are using a prepackaged version of Squid then please refer to the package vendor for availability information on updated packages. __________________________________________________________________ Determining if your version is vulnerable: The helper was shipped as mswin_check_lm_group with Squid-3.1 and older. Also as a third-party helper prior to Squid-2.6. All Squid using the mswin_check_lm_group helper for group based authorization are vulnerable. All Squid not using the ext_lm_group_acl helper for group based authorization are not vulnerable. All Squid-3.x up to and including 3.5.28 being used for NTLM Authentication with ext_lm_group_acl helper are vulnerable. All Squid-4.x up to and including 4.9 being used for NTLM Authentication with ext_lm_group_acl helper are vulnerable. To determine whether Squid-3.2 and later are configured to use the affected helper use the commands: squid -k parse | grep ext_lm_group_acl squid -k parse | grep mswin_check_lm_group To determine whether Squid-3.1 and older are configured to use the affected helper use the commands: grep ext_lm_group_acl /etc/squid/squid.conf grep mswin_check_lm_group /etc/squid/squid.conf __________________________________________________________________ Workarounds: Either; Remove 'auth_param NTLM ...' configuration settings from squid.conf. Or, Use ext_lm_group_acl binary built from Squid-4.10 or later versions. __________________________________________________________________ Contact details for the Squid project: For installation / upgrade support on binary packaged versions of Squid: Your first point of contact should be your binary package vendor. If your install and build Squid from the original Squid sources then the squid-users@lists.squid-cache.org mailing list is your primary support point. For subscription details see <http://www.squid-cache.org/Support/mailing-lists.html>. For reporting of non-security bugs in the latest STABLE release the squid bugzilla database should be used <http://bugs.squid-cache.org/>. For reporting of security sensitive bugs send an email to the squid-bugs@lists.squid-cache.org mailing list. It's a closed list (though anyone can post) and security related bug reports are treated in confidence until the impact has been established. __________________________________________________________________ Credits: This vulnerability was discovered and fixed by Aaron Costello <aaron.costello@ymail.com>. __________________________________________________________________ Revision history: 2019-11-11 10:25:02 UTC Initial Report 2019-11-22 02:44:29 UTC Patches Released __________________________________________________________________ END
This is an autogenerated message for OBS integration: This bug (1162691) was mentioned in https://build.opensuse.org/request/show/770216 Factory / squid
SUSE-SU-2020:0487-1: An update that fixes four vulnerabilities is now available. Category: security (moderate) Bug References: 1162687,1162689,1162691 CVE References: CVE-2019-12528,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 Sources used: SUSE Linux Enterprise Server 12-SP5 (src): squid-4.10-4.6.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2020:0493-1: An update that fixes four vulnerabilities is now available. Category: security (moderate) Bug References: 1162687,1162689,1162691 CVE References: CVE-2019-12528,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 Sources used: SUSE Linux Enterprise Module for Server Applications 15-SP1 (src): squid-4.10-5.14.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
openSUSE-SU-2020:0307-1: An update that fixes four vulnerabilities is now available. Category: security (moderate) Bug References: 1162687,1162689,1162691 CVE References: CVE-2019-12528,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 Sources used: openSUSE Leap 15.1 (src): squid-4.10-lp151.2.11.1
SUSE-SU-2020:0661-1: An update that fixes 10 vulnerabilities is now available. Category: security (important) Bug References: 1156323,1156324,1156326,1156328,1156329,1162687,1162689,1162691 CVE References: CVE-2019-12523,CVE-2019-12526,CVE-2019-12528,CVE-2019-18676,CVE-2019-18677,CVE-2019-18678,CVE-2019-18679,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 Sources used: SUSE OpenStack Cloud Crowbar 8 (src): squid-3.5.21-26.20.1 SUSE OpenStack Cloud 8 (src): squid-3.5.21-26.20.1 SUSE OpenStack Cloud 7 (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server for SAP 12-SP3 (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server for SAP 12-SP2 (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server 12-SP4 (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server 12-SP3-LTSS (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server 12-SP3-BCL (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server 12-SP2-LTSS (src): squid-3.5.21-26.20.1 SUSE Linux Enterprise Server 12-SP2-BCL (src): squid-3.5.21-26.20.1 SUSE Enterprise Storage 5 (src): squid-3.5.21-26.20.1 HPE Helion Openstack 8 (src): squid-3.5.21-26.20.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
This is an autogenerated message for OBS integration: This bug (1162691) was mentioned in https://build.opensuse.org/request/show/796564 Factory / squid
SUSE-SU-2020:1134-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1162689,1162691,1167373,1169659,1170313 CVE References: CVE-2019-12519,CVE-2019-12521,CVE-2019-12528,CVE-2019-18860,CVE-2020-11945,CVE-2020-8517 Sources used: SUSE Linux Enterprise Server 12-SP5 (src): squid-4.11-4.9.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2020:1156-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1162689,1162691,1167373,1169659,1170313 CVE References: CVE-2019-12519,CVE-2019-12521,CVE-2019-12528,CVE-2019-18860,CVE-2020-11945,CVE-2020-8517 Sources used: SUSE Linux Enterprise Server for SAP 15 (src): squid-4.11-5.17.2 SUSE Linux Enterprise Server 15-LTSS (src): squid-4.11-5.17.2 SUSE Linux Enterprise Module for Server Applications 15-SP2 (src): squid-4.11-5.17.2 SUSE Linux Enterprise Module for Server Applications 15-SP1 (src): squid-4.11-5.17.2 SUSE Linux Enterprise High Performance Computing 15-LTSS (src): squid-4.11-5.17.2 SUSE Linux Enterprise High Performance Computing 15-ESPOS (src): squid-4.11-5.17.2 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
openSUSE-SU-2020:0606-1: An update that fixes four vulnerabilities is now available. Category: security (moderate) Bug References: 1162687,1162689,1162691 CVE References: CVE-2019-12528,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 Sources used: openSUSE Leap 15.1 (src): squid-4.10-lp151.2.14.1
openSUSE-SU-2020:0623-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1162689,1162691,1167373,1169659,1170313 CVE References: CVE-2019-12519,CVE-2019-12521,CVE-2019-12528,CVE-2019-18860,CVE-2020-11945,CVE-2020-8517 Sources used: openSUSE Leap 15.1 (src): squid-4.11-lp151.2.15.2
SUSE-SU-2020:14460-1: An update that fixes 21 vulnerabilities is now available. Category: security (important) Bug References: 1140738,1141329,1141332,1156323,1156324,1156326,1156328,1156329,1162687,1162689,1162691,1167373,1169659,1170313,1170423,1173304,1173455 CVE References: CVE-2019-12519,CVE-2019-12520,CVE-2019-12521,CVE-2019-12523,CVE-2019-12524,CVE-2019-12525,CVE-2019-12526,CVE-2019-12528,CVE-2019-12529,CVE-2019-13345,CVE-2019-18676,CVE-2019-18677,CVE-2019-18678,CVE-2019-18679,CVE-2019-18860,CVE-2020-11945,CVE-2020-14059,CVE-2020-15049,CVE-2020-8449,CVE-2020-8450,CVE-2020-8517 JIRA References: Sources used: SUSE Linux Enterprise Server 11-SP4-LTSS (src): squid3-3.1.23-8.16.37.12.1 SUSE Linux Enterprise Point of Sale 11-SP3 (src): squid3-3.1.23-8.16.37.12.1 SUSE Linux Enterprise Debuginfo 11-SP4 (src): squid3-3.1.23-8.16.37.12.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.