A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O     file. (CVE-2019-20021)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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. (CVE-2018-11243)

  - canUnpack in p_vmlinx.cpp in UPX 3.95 allows remote attackers to cause a denial of service (SEGV or buffer
    overflow, and application crash) or possibly have unspecified other impact via a crafted UPX packed file.
    (CVE-2019-14296)

  - A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O
    file. (CVE-2019-20021)

  - An invalid memory address dereference was discovered in the canUnpack function in p_mach.cpp in UPX 3.95
    via a crafted Mach-O file. (CVE-2019-20053)

3.96, multiple security fixes.

----

Patch for CVE-2019-20021

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for upx to version 3.96 fixes the following issues :

  - CVE-2019-1010048: Fixed a denial of service in     PackLinuxElf32::PackLinuxElf32help1() (boo#1141777).

  - CVE-2019-14296: Fixed a denial of service in canUnpack()     (boo#1143839).

  - CVE-2019-20021: Fixed a heap-based buffer over-read in     canUnpack() (boo#1159833).

  - CVE-2019-20053: Fixed a denial of service in canUnpack()     (boo#1159920).

  - CVE-2018-11243: Fixed a denial of service in     PackLinuxElf64::unpack() (boo#1094138).

  - Update to version 3.96

  - Bug fixes: [CVE-2019-1010048, boo#1141777]     [CVE-2019-14296, boo#1143839] [CVE-2019-20021,     boo#1159833] [CVE-2019-20053, boo#1159920]     [CVE-2018-11243 partially - ticket 206 ONLY,     boo#1094138]

  - Update to version 3.95

  - Flag --force-pie when ET_DYN main program is not marked     as DF_1_PIE

  - Better compatibility with varying layout of address     space on Linux

  - Support for 4 PT_LOAD layout in ELF generated by     binutils-2.31

  - bug fixes, particularly better diagnosis of malformed     input

  - bug fixes - see https://github.com/upx/upx/milestone/4

ID	Name	Product	Family	Severity
256133	Linux Distros Unpatched Vulnerability : CVE-2019-20021	Nessus	Misc.	medium
427011	Alpine: multiple upx packages: security update to 3.96-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
427011	Alpine: multiple upx packages: security update to 3.96-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
133535	Fedora 31 : upx (2020-67590fbf08)	Nessus	Fedora Local Security Checks	high
133490	openSUSE Security Update : upx (openSUSE-2020-163)	Nessus	SuSE Local Security Checks	high
133423	Fedora 30 : upx (2020-20cf0743f5)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2019-20021

medium

Tenable Plugins

medium

high

high

high

high

high