CVE-2018-11243 Use after free in n/a

High 7.8 Published 18 May 2018 Updated 5 Aug 2024

Remote attackers can cause denial of service in UPX via a crafted file triggering a double free error during unpacking.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2018-11243?

CVE-2018-11243 is a high-severity use after free vulnerability in n/a, published on 18 May 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.

Weakness: CWE-415

Which versions are affected by CVE-2018-11243?

It affects 1 product.

Linux distribution packages (3)

`ucl` SUSE:Package Hub 15 SP1	All versions	`1.03-bp151.4.3.1`
`ucl` openSUSE:Leap 15.1	All versions	`1.03-lp151.3.3.1`
`ucl` openSUSE:Tumbleweed	All versions	`1.03-4.9`

Products include Upx Upx.

How do I fix CVE-2018-11243?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-11243 being exploited?

There is no known exploitation of CVE-2018-11243 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2018-11243, GHSA-xvcg-hv6h-729g, UBUNTU-CVE-2018-11243, openSUSE-SU-2020:0162-1, openSUSE-SU-2020:0179-1, openSUSE-SU-2024:11477-1.