SB2020020613 - MiKTeX security update for libpng

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2017-12652)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in libpng when checking the chuck length against the user limit. A remote attacker can supply a specially crafted PNG image and crash the affected application.

2) Memory leak (CVE-ID: CVE-2019-6129)

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in png_create_info_struct in png.c. A remote attacker can trigger memory leak and perform denial of service attack.

3) Use-after-free (CVE-ID: CVE-2019-7317)

The vulnerability allows a remote attacker to cause DoS condition.

The vulnerability exists due to a use-after-free memory error in the png_image_free function, as defined in the png.c source code file when calling on png_safe_execute. A remote attacker can send specially crafted data, trigger a call on png_safe_execute and trigger memory corruption, resulting in a DoS condition.

4) Stack-based buffer overflow (CVE-ID: CVE-2018-14550)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing images within the get_token() function in pnm2png. A remote attacker can create a specially crafted image, pass it to the affected application, trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://miktex.org/announcement/miktex-2-9-7300