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USN-6099-1: ncurses vulnerabilities

23 May 2023

Several security issues were fixed in ncurses.

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Releases

Packages

  • ncurses - shared libraries for terminal handling

Details

It was discovered that ncurses was incorrectly performing bounds
checks when processing invalid hashcodes. An attacker could possibly
use this issue to cause a denial of service or to expose sensitive
information. This issue only affected Ubuntu 18.04 LTS.
(CVE-2019-17594)

It was discovered that ncurses was incorrectly handling
end-of-string characters when processing terminfo and termcap files.
An attacker could possibly use this issue to cause a denial of
service or to expose sensitive information. This issue only affected
Ubuntu 18.04 LTS. (CVE-2019-17595)

It was discovered that ncurses was incorrectly handling
end-of-string characters when converting between termcap and
terminfo formats. An attacker could possibly use this issue to cause
a denial of service or execute arbitrary code. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-39537)

It was discovered that ncurses was incorrectly performing bounds
checks when dealing with corrupt terminfo data while reading a
terminfo file. An attacker could possibly use this issue to cause a
denial of service or to expose sensitive information. This issue only
affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS.
(CVE-2022-29458)

It was discovered that ncurses was parsing environment variables when
running with setuid applications and not properly handling the
processing of malformed data when doing so. A local attacker could
possibly use this issue to cause a denial of service (application
crash) or execute arbitrary code. (CVE-2023-29491)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 23.04
Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

In general, a standard system update will make all the necessary changes.

References

Related notices

  • USN-5477-1: libncurses5, libx32tinfo5, libx32ncurses5, libncurses5-dev, ncurses, lib32ncurses5, lib64tinfo5, lib32ncurses5-dev, lib32ncursesw5-dev, libncursesw5-dev, libtinfo5, ncurses-bin, lib64ncurses5-dev, libncursesw5, libtinfo-dev, lib32tinfo-dev, libx32ncursesw5-dev, lib32ncursesw5, libx32ncurses5-dev, ncurses-base, ncurses-term, ncurses-doc, lib32tinfo5, lib64ncurses5, libx32ncursesw5, ncurses-examples, libx32tinfo-dev

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Further reading