RHSA-2020:4743 - Security Advisory

Topic

An update for the squid:4 module is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)

Security Fix(es):

• squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)
• squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)
• squid: Improper input validation in URI processor (CVE-2019-12523)
• squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)
• squid: Heap overflow issue in URN processing (CVE-2019-12526)
• squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)
• squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)
• squid: Denial of service in cachemgr.cgi (CVE-2019-12854)
• squid: Buffer overflow in URI processor (CVE-2019-18676)
• squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)
• squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)
• squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)
• squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)
• squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)
• squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)
• squid: DoS in TLS handshake (CVE-2020-14058)
• squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)
• squid: Improper input validation could result in a DoS (CVE-2020-24606)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the squid service will be restarted automatically.

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.4 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.4 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.4 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.4 aarch64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 8.4 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 8.4 x86_64

Fixes

• BZ - 1730523 - CVE-2019-12854 squid: Denial of service in cachemgr.cgi
• BZ - 1730528 - CVE-2019-12529 squid: Out of bounds read in Proxy-Authorization header causes DoS
• BZ - 1770349 - CVE-2019-18678 squid: HTTP Request Splitting issue in HTTP message processing
• BZ - 1770356 - CVE-2019-12526 squid: Heap overflow issue in URN processing
• BZ - 1770360 - CVE-2019-18679 squid: Information Disclosure issue in HTTP Digest Authentication
• BZ - 1770365 - CVE-2019-18677 squid: Cross-Site Request Forgery issue in HTTP Request processing
• BZ - 1770371 - CVE-2019-12523 squid: Improper input validation in URI processor
• BZ - 1770375 - CVE-2019-18676 squid: Buffer overflow in URI processor
• BZ - 1798534 - CVE-2019-12528 squid: Information Disclosure issue in FTP Gateway
• BZ - 1798540 - CVE-2020-8449 squid: Improper input validation issues in HTTP Request processing
• BZ - 1798552 - CVE-2020-8450 squid: Buffer overflow in reverse-proxy configurations
• BZ - 1817121 - CVE-2019-18860 squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour
• BZ - 1827558 - CVE-2019-12520 squid: Improper input validation in request allows for proxy manipulation
• BZ - 1827562 - CVE-2019-12521 squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash
• BZ - 1827570 - CVE-2019-12524 squid: Improper access restriction in url_regex may lead to security bypass
• BZ - 1852550 - CVE-2020-15049 squid: Request smuggling and poisoning attack against the HTTP cache
• BZ - 1852554 - CVE-2020-14058 squid: DoS in TLS handshake
• BZ - 1871705 - CVE-2020-24606 squid: Improper input validation could result in a DoS

CVEs

• CVE-2019-12520
• CVE-2019-12521
• CVE-2019-12523
• CVE-2019-12524
• CVE-2019-12526
• CVE-2019-12528
• CVE-2019-12529
• CVE-2019-12854
• CVE-2019-18676
• CVE-2019-18677
• CVE-2019-18678
• CVE-2019-18679
• CVE-2019-18860
• CVE-2020-8449
• CVE-2020-8450
• CVE-2020-14058
• CVE-2020-15049
• CVE-2020-24606

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_release_notes/