Issued:
2020-04-06
Updated:
2020-04-06

RHSA-2020:1335 - Security Advisory

Synopsis

Important: telnet security update

Type/Severity

Security Advisory: Important

Topic

An update for telnet is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. 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

Telnet is a popular protocol for logging in to remote systems over the Internet. The telnet-server packages include a telnet service that supports remote logins into the host machine. The telnet service is disabled by default.

Security Fix(es):

  • telnet-server: no bounds checks in nextitem() function allows to remotely execute arbitrary code (CVE-2020-10188)

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.

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

Affected Products

  • Red Hat Enterprise Linux Server 6 x86_64
  • Red Hat Enterprise Linux Server 6 i386
  • Red Hat Enterprise Linux Workstation 6 x86_64
  • Red Hat Enterprise Linux Workstation 6 i386
  • Red Hat Enterprise Linux Desktop 6 x86_64
  • Red Hat Enterprise Linux Desktop 6 i386
  • Red Hat Enterprise Linux for IBM z Systems 6 s390x
  • Red Hat Enterprise Linux for Power, big endian 6 ppc64
  • Red Hat Enterprise Linux for Scientific Computing 6 x86_64

Fixes

  • BZ - 1811673 - CVE-2020-10188 telnet-server: no bounds checks in nextitem() function allows to remotely execute arbitrary code

CVEs

References

Red Hat Enterprise Linux Server 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
x86_64
telnet-0.17-49.el6_10.x86_64.rpm SHA-256: 2dce2be7f4754745e9100b6daed073e67ee0225288516d97624c2c4305494d1d
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm SHA-256: 66eae337940685341aef185c386c62eb858d8a963afd3a9d14a01a186baece7c
telnet-server-0.17-49.el6_10.x86_64.rpm SHA-256: a5ee9c9fe5f36416eb4d0d393b6add58127fabc93e511fb472591b471319bb57
i386
telnet-0.17-49.el6_10.i686.rpm SHA-256: d7ef165f672d472bb447ab5438090ea73dbc9b04e07caead51b712589216781a
telnet-debuginfo-0.17-49.el6_10.i686.rpm SHA-256: 84f4acf02ef5cd0ebb22ac0ee3e38bc551c2aa47c2fafb47dc80be7912e3cb36
telnet-server-0.17-49.el6_10.i686.rpm SHA-256: 0aac7f15f777acdb646a197bc603c1b4a3fe9c02286c296fb25af2ec9c98a6ca

Red Hat Enterprise Linux Workstation 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
x86_64
telnet-0.17-49.el6_10.x86_64.rpm SHA-256: 2dce2be7f4754745e9100b6daed073e67ee0225288516d97624c2c4305494d1d
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm SHA-256: 66eae337940685341aef185c386c62eb858d8a963afd3a9d14a01a186baece7c
telnet-server-0.17-49.el6_10.x86_64.rpm SHA-256: a5ee9c9fe5f36416eb4d0d393b6add58127fabc93e511fb472591b471319bb57
i386
telnet-0.17-49.el6_10.i686.rpm SHA-256: d7ef165f672d472bb447ab5438090ea73dbc9b04e07caead51b712589216781a
telnet-debuginfo-0.17-49.el6_10.i686.rpm SHA-256: 84f4acf02ef5cd0ebb22ac0ee3e38bc551c2aa47c2fafb47dc80be7912e3cb36
telnet-server-0.17-49.el6_10.i686.rpm SHA-256: 0aac7f15f777acdb646a197bc603c1b4a3fe9c02286c296fb25af2ec9c98a6ca

Red Hat Enterprise Linux Desktop 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
x86_64
telnet-0.17-49.el6_10.x86_64.rpm SHA-256: 2dce2be7f4754745e9100b6daed073e67ee0225288516d97624c2c4305494d1d
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm SHA-256: 66eae337940685341aef185c386c62eb858d8a963afd3a9d14a01a186baece7c
telnet-server-0.17-49.el6_10.x86_64.rpm SHA-256: a5ee9c9fe5f36416eb4d0d393b6add58127fabc93e511fb472591b471319bb57
i386
telnet-0.17-49.el6_10.i686.rpm SHA-256: d7ef165f672d472bb447ab5438090ea73dbc9b04e07caead51b712589216781a
telnet-debuginfo-0.17-49.el6_10.i686.rpm SHA-256: 84f4acf02ef5cd0ebb22ac0ee3e38bc551c2aa47c2fafb47dc80be7912e3cb36
telnet-server-0.17-49.el6_10.i686.rpm SHA-256: 0aac7f15f777acdb646a197bc603c1b4a3fe9c02286c296fb25af2ec9c98a6ca

Red Hat Enterprise Linux for IBM z Systems 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
s390x
telnet-0.17-49.el6_10.s390x.rpm SHA-256: 9642430bd254f17ceefd466aa4832e1aff71cd894aa47cde9273bd15c3b2ab34
telnet-debuginfo-0.17-49.el6_10.s390x.rpm SHA-256: 3ba85ecd35b24ba42c2306a38fc076058dad8709d515ea8b4a9a28f86ade2db6
telnet-server-0.17-49.el6_10.s390x.rpm SHA-256: d1cd168502bc37d16b8deb087592c14c3edd91d14a06f36f2b166170a697598e

Red Hat Enterprise Linux for Power, big endian 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
ppc64
telnet-0.17-49.el6_10.ppc64.rpm SHA-256: d2d23284f28c0784db08cf7451a48620714e5bb488d70d2919b3ea824b96778e
telnet-debuginfo-0.17-49.el6_10.ppc64.rpm SHA-256: 356297e6a8d7c3d1c6a1ec31d384391759d704080600aad0c58cb4a941ec6c9a
telnet-server-0.17-49.el6_10.ppc64.rpm SHA-256: 6aef0596ddf835b29b4c4111cbda1374835e65137eafe7b1f1c0d804c0b93733

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
telnet-0.17-49.el6_10.src.rpm SHA-256: 09b8cc67fb489600c94af36f75d363405445abd329a2f870f247d84744257fc2
x86_64
telnet-0.17-49.el6_10.x86_64.rpm SHA-256: 2dce2be7f4754745e9100b6daed073e67ee0225288516d97624c2c4305494d1d
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm SHA-256: 66eae337940685341aef185c386c62eb858d8a963afd3a9d14a01a186baece7c
telnet-server-0.17-49.el6_10.x86_64.rpm SHA-256: a5ee9c9fe5f36416eb4d0d393b6add58127fabc93e511fb472591b471319bb57

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.