==========================================================================
Ubuntu Security Notice USN-5922-1
March 06, 2023

fribidi vulnerabilities
==========================================================================

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in fribidi.

Software Description:
- fribidi: Free Implementation of the Unicode BiDi algorithm (utility)

Details:

It was discovered that FriBidi incorrectly handled the processing of input
strings, resulting in memory corruption. An attacker could possibly use this
issue to cause FriBidi to crash, resulting in a denial of service, or
potentially execute arbitrary code. (CVE-2022-25308)

It was discovered that FriBidi incorrectly validated input data to its 
CapRTL
unicode encoder, resulting in memory corruption. An attacker could possibly
use this issue to cause FriBidi to crash, resulting in a denial of 
service, or
potentially execute arbitrary code. (CVE-2022-25309)

It was discovered that FriBidi incorrectly handled empty input when removing
marks from unicode strings. An attacker could possibly use this to cause
FriBidi to crash, resulting in a denial of service, or potentially execute
arbitrary code. (CVE-2022-25310)

Update instructions:

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

Ubuntu 16.04 ESM:
   libfribidi-bin                  0.19.7-1ubuntu0.1~esm1
   libfribidi0                      0.19.7-1ubuntu0.1~esm1

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

References:
   https://ubuntu.com/security/notices/USN-5922-1
   CVE-2022-25308, CVE-2022-25309, CVE-2022-25310