CVE-2021-27135

Severity

98%

Complexity

39%

Confidentiality

98%

xterm through Patch #365 allows remote attackers to cause a denial of service (segmentation fault) or possibly have unspecified other impact via a crafted UTF-8 character sequence.

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.

CVSS 3.1 Base Score 9.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P).

Overview

First reported 4 years ago

2021-02-10 16:15:00

Last updated 3 years ago

2021-05-21 08:15:00

Affected Software

Debian Linux 9.0

9.0

References

[oss-security] 20210210 Re: Re: screen crash processing combining characters

https://www.openwall.com/lists/oss-security/2021/02/09/7

https://www.openwall.com/lists/oss-security/2021/02/09/9

[debian-lts-announce] 20210213 [SECURITY] [DLA 2558-1] xterm security update

[oss-security] 20210210 Re: Re: screen crash processing combining characters

Mailing List, Third Party Advisory

[debian-lts-announce] 20210213 [SECURITY] [DLA 2558-1] xterm security update

Mailing List, Third Party Advisory

https://www.openwall.com/lists/oss-security/2021/02/09/7

Mailing List, Third Party Advisory

https://www.openwall.com/lists/oss-security/2021/02/09/9

Mailing List, Third Party Advisory

FEDORA-2021-e7a8e79fa8

FEDORA-2021-e7a8e79fa8

Mailing List, Patch, Third Party Advisory

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://news.ycombinator.com/item?id=26524650

https://access.redhat.com/security/cve/CVE-2021-27135

Third Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=1927559

Issue Tracking

https://bugzilla.suse.com/show_bug.cgi?id=1182091

Issue Tracking

https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c

Patch, Third Party Advisory

https://invisible-island.net/xterm/xterm.log.html

Release Notes, Vendor Advisory

https://news.ycombinator.com/item?id=26524650

Issue Tracking, Third Party Advisory

20210520 CVE-2021-31535 libX11 Insufficient Length Checks PoC and Archeology

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