An issue was discovered in klibc before 2.0.9. Multiple possible integer overflows in the cpio command on 32-bit systems may result in a buffer overflow or other security impact.

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

  - An issue was discovered in klibc before 2.0.9. Multiplication in the calloc() function may result in an
    integer overflow and a subsequent heap buffer overflow. (CVE-2021-31870)

  - An issue was discovered in klibc before 2.0.9. An integer overflow in the cpio command may result in a
    NULL pointer dereference on 64-bit systems. (CVE-2021-31871)

  - An issue was discovered in klibc before 2.0.9. Multiple possible integer overflows in the cpio command on
    32-bit systems may result in a buffer overflow or other security impact. (CVE-2021-31872)

  - An issue was discovered in klibc before 2.0.9. Additions in the malloc() function may result in an integer
    overflow and a subsequent heap buffer overflow. (CVE-2021-31873)

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5379-1 advisory.

    It was discovered that klibc did not properly perform some mathematical operations, leading to an integer     overflow. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2021-31870)

    It was discovered that klibc did not properly handled some memory allocations on 64 bit systems. An     attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2021-31871)

    It was discovered that klibc did not properly handled some file sizes values on 32 bit systems. An     attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2021-31872)

    It was discovered that klibc did not properly handled some memory allocations. An attacker could possibly     use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2021-31873)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2695 advisory.

  - An issue was discovered in klibc before 2.0.9. Multiplication in the calloc() function may result in an     integer overflow and a subsequent heap buffer overflow. (CVE-2021-31870)

  - An issue was discovered in klibc before 2.0.9. An integer overflow in the cpio command may result in a     NULL pointer dereference on 64-bit systems. (CVE-2021-31871)

  - An issue was discovered in klibc before 2.0.9. Multiple possible integer overflows in the cpio command on     32-bit systems may result in a buffer overflow or other security impact. (CVE-2021-31872)

  - An issue was discovered in klibc before 2.0.9. Additions in the malloc() function may result in an integer     overflow and a subsequent heap buffer overflow. (CVE-2021-31873)

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	Type	Severity
408077	Alpine: libklibc, multiple klibc packages: security update to 2.0.9-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
408077	Alpine: libklibc, multiple klibc packages: security update to 2.0.9-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
159882	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : klibc vulnerabilities (USN-5379-1)	Nessus	Ubuntu Local Security Checks	Local	critical
151361	Debian DLA-2695-1 : klibc - LTS security update	Nessus	Debian Local Security Checks	Local	critical

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CVE-2021-31872

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