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Debian LTS Advisory DLA-3682-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                       Guilhem Moulin
December 03, 2023                             https://wiki.debian.org/LTS
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Package        : ncurses
Version        : 6.1+20181013-2+deb10u5
CVE ID         : CVE-2021-39537 CVE-2023-29491
Debian Bug     : 1034372

Issues were found in ncurses, a collection of shared libraries for
terminal handling, which could lead to denial of service.

CVE-2021-39537

    It has been discovered that the tic(1) utility is susceptible to a
    heap overflow on crafted input due to improper bounds checking.

CVE-2023-29491

    Jonathan Bar Or, Michael Pearse and Emanuele Cozzi have discovered
    that when ncurses is used by a setuid application, a local user can
    trigger security-relevant memory corruption via malformed data in a
    terminfo database file found in $HOME/.terminfo or reached via the
    TERMINFO or TERM environment variables.

    In order to mitigate this issue, ncurses now further restricts
    programs running with elevated privileges (setuid/setgid programs).
    Programs run by the superuser remain able to load custom terminfo
    entries.

    This change aligns ncurses' behavior in buster-security with that of
    Debian Bullseye's latest point release (6.2+20201114-2+deb11u2).

For Debian 10 buster, these problems have been fixed in version
6.1+20181013-2+deb10u5.

We recommend that you upgrade your ncurses packages.

For the detailed security status of ncurses please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/ncurses

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

Debian LTS: DLA-3682-1: ncurses security update

December 3, 2023
Issues were found in ncurses, a collection of shared libraries for terminal handling, which could lead to denial of service

Summary

CVE-2021-39537

It has been discovered that the tic(1) utility is susceptible to a
heap overflow on crafted input due to improper bounds checking.

CVE-2023-29491

Jonathan Bar Or, Michael Pearse and Emanuele Cozzi have discovered
that when ncurses is used by a setuid application, a local user can
trigger security-relevant memory corruption via malformed data in a
terminfo database file found in $HOME/.terminfo or reached via the
TERMINFO or TERM environment variables.

In order to mitigate this issue, ncurses now further restricts
programs running with elevated privileges (setuid/setgid programs).
Programs run by the superuser remain able to load custom terminfo
entries.

This change aligns ncurses' behavior in buster-security with that of
Debian Bullseye's latest point release (6.2+20201114-2+deb11u2).

For Debian 10 buster, these problems have been fixed in version
6.1+20181013-2+deb10u5.

We recommend that you upgrade your ncurses packages.

For the detailed security status of ncurses please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/ncurses

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
Package : ncurses
Version : 6.1+20181013-2+deb10u5
CVE ID : CVE-2021-39537 CVE-2023-29491
Debian Bug : 1034372

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