Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 515
Alerts This Week
Warning Icon 1 515

Red Hat Enterprise Linux Moderate Update: Gcc-Toolset-11-Gcc Trojan Source

red hat
Calendar Grey November 10, 2021
Scroller Redhat
Minor patch released for gcc-toolset-11-gcc tackling trojan source issues within Red Hat Enterprise Linux.
An update for gcc-toolset-11-gcc is now available for Red Hat Enterprise Linux 8

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

Summary

The gcc packages provide compilers for C, C++, Java, Fortran, Objective C, and Ada 95 GNU, as well as related support libraries.
Security Fix(es):
* Developer environment: Unicode's bidirectional (BiDi) override characterscan cause trojan source attacks (CVE-2021-42574)
The following changes were introduced in gcc in order to facilitate detection of BiDi Unicode characters:
This update implements a new warning option -Wbidirectional to warn about possibly dangerous bidirectional characters.
There are three levels of warning supported by gcc: "-Wbidirectional=unpaired", which warns about improperly terminated BiDi contexts. (This is the default.) "-Wbidirectional=none", which turns the warning off. "-Wbidirectional=any", which warns about any use of bidirectional characters.
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.

Topics%20covered

Topics Covered

security advisory moderate impact Red Hat Enterprise trojan attack gcc-toolset Unicode security

References

https://access.redhat.com/security/cve/CVE-2021-42574 https://access.redhat.com/security/updates/classification#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-007

Package List

Red Hat Enterprise Linux AppStream (v. 8):
Source: gcc-toolset-11-gcc-11.2.1-1.2.el8_5.src.rpm
aarch64: gcc-toolset-11-gcc-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-c++-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-c++-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-gdb-plugin-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-gdb-plugin-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-gfortran-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-gfortran-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-plugin-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-gcc-plugin-devel-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libasan-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libatomic-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libgccjit-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libgccjit-debuginfo-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libgccjit-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libgccjit-docs-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libitm-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-liblsan-devel-11.2.1-1.2.el8_5.aarch64.rpm gcc-toolset-11-libstdc++-devel-11.2.1-1.2.el8_5.aarch64.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:4586-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4586
Issue date: 2021-11-10

Topic

An update for gcc-toolset-11-gcc is now available for Red Hat EnterpriseLinux 8.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate impact Red Hat Enterprise trojan attack gcc-toolset Unicode security

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

2005819 - CVE-2021-42574 Developer environment: Unicode's bidirectional (BiDi) override characters can cause trojan source attacks

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.