CVE-2021-27135
First published: Wed Feb 10 2021(Updated: )
A crash was reported in xterm prior to patch #366 when processing a specially crafted sequence of combining characters. The cause is an out of bounds write, which may be exploitable to cause arbitrary code execution. <a href="https://www.openwall.com/lists/oss-security/2021/02/09/7">https://www.openwall.com/lists/oss-security/2021/02/09/7</a> <a href="https://invisible-island.net/xterm/xterm.log.html">https://invisible-island.net/xterm/xterm.log.html</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/xterm | 344-1+deb10u2 366-1+deb11u1 379-1 386-1 387-1 | |
| redhat/xterm | <366 | 366 |
| xterm | <366 | |
| Debian Linux | =9.0 | |
| Red Hat Fedora | =33 |
Remedy
https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://seclists.org/fulldisclosure/2021/May/52
- http://www.openwall.com/lists/oss-security/2021/02/10/7
- https://access.redhat.com/security/cve/CVE-2021-27135
- https://bugzilla.redhat.com/show_bug.cgi?id=1927559
- https://bugzilla.suse.com/show_bug.cgi?id=1182091
- https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c
- https://invisible-island.net/xterm/xterm.log.html
- https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/
- https://news.ycombinator.com/item?id=26524650
- https://security.gentoo.org/glsa/202208-22
- https://www.openwall.com/lists/oss-security/2021/02/09/7
- https://www.openwall.com/lists/oss-security/2021/02/09/9
- https://invisible-island.net/xterm/xterm.log.html#xterm_366
- https://security-tracker.debian.org/tracker/CVE-2021-27135
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1927570
- https://access.redhat.com/errata/RHSA-2021:0611
- https://access.redhat.com/security/cve/cve-2021-27135
- https://access.redhat.com/errata/RHSA-2021:0617
- https://access.redhat.com/errata/RHSA-2021:0650
- https://access.redhat.com/errata/RHSA-2021:0651
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/
Frequently Asked Questions
What is the severity of CVE-2021-27135?
The severity of CVE-2021-27135 is classified as high due to the potential for arbitrary code execution.
How do I fix CVE-2021-27135?
To fix CVE-2021-27135, update xterm to version 366 or later for affected distributions.
What systems are affected by CVE-2021-27135?
CVE-2021-27135 affects various versions of xterm on Debian, Red Hat, and Fedora systems.
Can CVE-2021-27135 be exploited remotely?
CVE-2021-27135 has the potential for exploitation, but whether it can be exploited remotely depends on the configurations and context of the application.
What are the symptoms of exploitation of CVE-2021-27135?
Exploitation of CVE-2021-27135 could result in application crashes or, in a successful scenario, arbitrary code execution on the affected system.
- collector/security-tracker-debian
- agent/type
- agent/remedy
- agent/severity
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-27135
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/references
- agent/description
- agent/event
- agent/first-publish-date
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/debian
- package-manager/redhat
- vendor/invisible-island
- canonical/xterm
- vendor/debian
- canonical/debian linux
- version/debian linux/9.0
- vendor/fedoraproject
- canonical/red hat fedora
- version/red hat fedora/33