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.

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

  - 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)

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 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 remote Fedora 33 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-4b43992608 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)

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

The remote Fedora 32 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-dff7e97510 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)

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	Severity
223677	Linux Distros Unpatched Vulnerability : CVE-2021-20285	Nessus	Misc.	medium
174145	openSUSE 15 Security Update : upx (openSUSE-SU-2023:0088-1)	Nessus	SuSE Local Security Checks	high
147945	Fedora 33 : upx (2021-4b43992608)	Nessus	Fedora Local Security Checks	medium
147942	Fedora 32 : upx (2021-dff7e97510)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2021-20285

medium

Tenable Plugins

medium

high

medium

medium