RHSA-2020:1068 - Security Advisory

Topic

An update for squid is now available for Red Hat Enterprise Linux 7.

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.

[Updated 22 October 2020]
This update was found to introduce a bug in cachemgr.cgi that could prevent access to the cache manager. This is not a security regression. The fix is being tracked in https://bugzilla.redhat.com/show_bug.cgi?id=1890581

Description

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

Security Fix(es):

• squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service (CVE-2018-1000024)
• squid: Incorrect pointer handling in HTTP processing and certificate download can lead to denial of service (CVE-2018-1000027)
• squid: XSS via user_name or auth parameter in cachemgr.cgi (CVE-2019-13345)

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 7.8 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 Server 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 1536939 - CVE-2018-1000024 squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service
• BZ - 1536942 - CVE-2018-1000027 squid: Incorrect pointer handling in HTTP processing and certificate download can lead to denial of service
• BZ - 1680022 - squid can't display download/upload packet size for HTTPS sites
• BZ - 1717430 - Excessive memory usage when running out of descriptors
• BZ - 1727744 - CVE-2019-13345 squid: XSS via user_name or auth parameter in cachemgr.cgi

CVEs

• CVE-2018-1000024
• CVE-2018-1000027
• CVE-2019-13345

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.8_release_notes/index