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

  - A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow
    allows an attacker to cause a denial of service (abort) via a crafted file. (CVE-2023-23456)

  - A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker
    with a crafted input file allows invalid memory address access that could lead to a denial of service.
    (CVE-2023-23457)

The remote Fedora 36 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-8d91390935 advisory.

    Patches for CVE-2023-23456 and CVE-2023-23457

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-89fdc22ace advisory.

    Patches for CVE-2023-23456 and CVE-2023-23457

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2023:0088-1 advisory.

  - A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial     of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via     a crafted ELF. The highest threat from this vulnerability is to system availability. (CVE-2021-20285)

  - Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0.
    That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
    (CVE-2021-30500)

  - An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows     attackers to cause a denial of service (abort) via a crafted file. (CVE-2021-30501)

  - A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5382. (CVE-2021-43311)

  - A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible     address. The issue is being triggered in the function PackLinuxElf64::invert_pt_dynamic at     p_lx_elf.cpp:5239. (CVE-2021-43312)

  - A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible     address. The issue is being triggered in the function PackLinuxElf32::invert_pt_dynamic at     p_lx_elf.cpp:1688. (CVE-2021-43313)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5368 (CVE-2021-43314)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5349 (CVE-2021-43315)

  - A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le64(). (CVE-2021-43316)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf64::elf_lookup()     at p_lx_elf.cpp:5404 (CVE-2021-43317)

  - A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow     allows an attacker to cause a denial of service (abort) via a crafted file. (CVE-2023-23456)

  - A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker     with a crafted input file allows invalid memory address access that could lead to a denial of service.
    (CVE-2023-23457)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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

  - A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker     with a crafted input file allows invalid memory address access that could lead to a denial of service.
    (CVE-2023-23457)

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

The remote openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2023:0031-1 advisory.

  - A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker     with a crafted input file allows invalid memory address access that could lead to a denial of service.
    (CVE-2023-23457)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
427261	Alpine: multiple upx packages: security update to 4.0.2-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	medium
427261	Alpine: multiple upx packages: security update to 4.0.2-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	medium
170258	Fedora 36 : upx (2023-8d91390935)	Nessus	Fedora Local Security Checks	1/22/2023	11/14/2024	medium
170264	Fedora 37 : upx (2023-89fdc22ace)	Nessus	Fedora Local Security Checks	1/22/2023	11/14/2024	medium
174145	openSUSE 15 Security Update : upx (openSUSE-SU-2023:0088-1)	Nessus	SuSE Local Security Checks	4/12/2023	4/19/2023	high
225903	Linux Distros Unpatched Vulnerability : CVE-2023-23457	Nessus	Misc.	3/5/2025	7/12/2026	medium
170493	openSUSE 15 Security Update : upx (openSUSE-SU-2023:0031-1)	Nessus	SuSE Local Security Checks	1/24/2023	9/6/2023	medium

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