Exploit/Advisories

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Ubuntu Security Notice USN-5448-1
May 26, 2022

ncurses vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in ncurses.

Software Description:
- ncurses: shared libraries for terminal handling (32-bit)

Details:

It was discovered that ncurses was not properly checking array bounds
when executing the fmt_entry function, which could result in an
out-of-bounds write. An attacker could possibly use this issue to
execute arbitrary code. (CVE-2017-10684)

It was discovered that ncurses was not properly checking user input,
which could result in it being treated as a format argument. An
attacker could possibly use this issue to expose sensitive
information or to execute arbitrary code. (CVE-2017-10685)

It was discovered that ncurses was incorrectly performing memory
management operations and was not blocking access attempts to
illegal memory locations. An attacker could possibly use this issue
to cause a denial of service. (CVE-2017-11112, CVE-2017-13729,
CVE-2017-13730, CVE-2017-13731, CVE-2017-13732, CVE-2017-13733,
CVE-2017-13734)

It was discovered that ncurses was not properly performing checks
on pointer values before attempting to access the related memory
locations, which could lead to NULL pointer dereferencing. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2017-11113)

It was discovered that ncurses was incorrectly handling loops in
libtic, which could lead to the execution of an infinite loop. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2017-13728)

Update instructions:

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

Ubuntu 16.04 ESM:
lib32ncurses5 6.0+20160213-1ubuntu1+esm1
lib32ncursesw5 6.0+20160213-1ubuntu1+esm1
lib32tinfo5 6.0+20160213-1ubuntu1+esm1
lib64ncurses5 6.0+20160213-1ubuntu1+esm1
lib64tinfo5 6.0+20160213-1ubuntu1+esm1
libncurses5 6.0+20160213-1ubuntu1+esm1
libncursesw5 6.0+20160213-1ubuntu1+esm1
libtinfo5 6.0+20160213-1ubuntu1+esm1
libx32ncurses5 6.0+20160213-1ubuntu1+esm1
libx32ncursesw5 6.0+20160213-1ubuntu1+esm1
libx32tinfo5 6.0+20160213-1ubuntu1+esm1
ncurses-base 6.0+20160213-1ubuntu1+esm1
ncurses-bin 6.0+20160213-1ubuntu1+esm1
ncurses-term 6.0+20160213-1ubuntu1+esm1

Ubuntu 14.04 ESM:
lib32ncurses5 5.9+20140118-1ubuntu1+esm1
lib32ncursesw5 5.9+20140118-1ubuntu1+esm1
lib32tinfo5 5.9+20140118-1ubuntu1+esm1
lib64ncurses5 5.9+20140118-1ubuntu1+esm1
lib64tinfo5 5.9+20140118-1ubuntu1+esm1
libncurses5 5.9+20140118-1ubuntu1+esm1
libncursesw5 5.9+20140118-1ubuntu1+esm1
libtinfo5 5.9+20140118-1ubuntu1+esm1
libx32ncurses5 5.9+20140118-1ubuntu1+esm1
libx32ncursesw5 5.9+20140118-1ubuntu1+esm1
libx32tinfo5 5.9+20140118-1ubuntu1+esm1
ncurses-base 5.9+20140118-1ubuntu1+esm1
ncurses-bin 5.9+20140118-1ubuntu1+esm1
ncurses-term 5.9+20140118-1ubuntu1+esm1

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

References:
https://ubuntu.com/security/notices/USN-5448-1
CVE-2017-10684, CVE-2017-10685, CVE-2017-11112, CVE-2017-11113,
CVE-2017-13728, CVE-2017-13729, CVE-2017-13730, CVE-2017-13731,
CVE-2017-13732, CVE-2017-13733, CVE-2017-13734

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