Alerts This Week
Warning Icon 1 714
Alerts This Week
Warning Icon 1 714

Red Hat 8: RHSA-2021-4587 Moderate: GCC Unicode Trojans Attack

red hat
Calendar Grey November 10, 2021
Dist Redhat Esm H88
Red Hat releases a substantial security patch for gcc on RHEL 8 to address unicode trojan source vulnerabilities. Update your systems promptly!
An update for 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 Red Hat software update moderate threat unicode attacks GCC

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):
aarch64: cpp-8.5.0-4.el8_5.aarch64.rpm cpp-debuginfo-8.5.0-4.el8_5.aarch64.rpm gcc-8.5.0-4.el8_5.aarch64.rpm gcc-c++-8.5.0-4.el8_5.aarch64.rpm gcc-c++-debuginfo-8.5.0-4.el8_5.aarch64.rpm gcc-debuginfo-8.5.0-4.el8_5.aarch64.rpm gcc-debugsource-8.5.0-4.el8_5.aarch64.rpm gcc-gdb-plugin-8.5.0-4.el8_5.aarch64.rpm gcc-gdb-plugin-debuginfo-8.5.0-4.el8_5.aarch64.rpm gcc-gfortran-8.5.0-4.el8_5.aarch64.rpm gcc-gfortran-debuginfo-8.5.0-4.el8_5.aarch64.rpm gcc-plugin-devel-debuginfo-8.5.0-4.el8_5.aarch64.rpm libasan-debuginfo-8.5.0-4.el8_5.aarch64.rpm libatomic-debuginfo-8.5.0-4.el8_5.aarch64.rpm libgcc-debuginfo-8.5.0-4.el8_5.aarch64.rpm libgfortran-debuginfo-8.5.0-4.el8_5.aarch64.rpm libgomp-debuginfo-8.5.0-4.el8_5.aarch64.rpm libitm-debuginfo-8.5.0-4.el8_5.aarch64.rpm libitm-devel-8.5.0-4.el8_5.aarch64.rpm liblsan-debuginfo-8.5.0-4.el8_5.aarch64.rpm libstdc++-debuginfo-8.5.0-4.el8_5.aarch64.rpm libstdc++-devel-8.5.0-4.el8_5.aarch64.rpm libstdc++-docs-8.5.0-4.el8_5.aarch64.rpm libtsan-debuginfo-8.5.0-4.el8_5.aarch64.rpm libubsan-debuginfo-8.5.0-4.el8_5.aarch64.rpm
ppc64le: cpp-8.5.0-4.el8_5.ppc64le.rpm cpp-debuginfo-8.5.0-4.el8_5.ppc64le.rpm gcc-8.5.0-4.el8_5.ppc64le.rpm gcc-c++-8.5.0-4.el8_5.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:4587-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4587
Issue date: 2021-11-10

Topic

An update for gcc is now available for Red Hat Enterprise Linux 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 Red Hat software update moderate threat unicode attacks GCC

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64

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

Red Hat Enterprise Linux BaseOS (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.

Your message here