CVE-2019-9923

pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain archives that have malformed extended headers.

pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain archives that have malformed extended headers.

• SECURITY UPDATE: NULL pointer dereference
  • debian/patches/CVE-2019-9923.patch: fix a NULL pointer dereference when parsing certain archives that have malformed extended headers in pax_decode_header() in sparse.c
  • CVE-2019-9923

• CVE-2019-9923: fix possible NULL dereference in pax_decode_header

• CVE-2019-9923: fix possible NULL dereference in pax_decode_header

• CVE-2019-9923: fix NULL pointer dereference in pax_decode_header on malformed PAX extended headers

• CVE-2019-9923: fix NULL pointer dereference in pax_decode_header on malformed PAX extended headers

pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain archives that have malformed extended headers (CVE-2019-9923).

This update for tar fixes the following issues:

Security issues fixed:

• CVE-2019-9923: Fixed a denial of service while parsing certain archives with malformed extended headers in pax_decode_header() (bsc#1130496).
• CVE-2018-20482: Fixed a denial of service when the '--sparse' option mishandles file shrinkage during read access (bsc#1120610).

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the tar-1.34-2.2 package on the GA media of openSUSE Tumbleweed.

This update for tar fixes the following issues:

Security issues fixed:

• CVE-2019-9923: Fixed a denial of service while parsing certain archives with malformed extended headers in pax_decode_header() (bsc#1130496).
• CVE-2018-20482: Fixed a denial of service when the '--sparse' option mishandles file shrinkage during read access (bsc#1120610).

This update for tar to version 1.27.1 fixes the following issues:

tar 1.27.1 brings following changes (jsc#ECO-339)

• Sparse files with large data
• No backticks in quoting
• --owner and --group names and numbers
• Support for POSIX ACLs, extended attributes and SELinux context.
• Passing command line arguments to external commands.
• New configure option --enable-gcc-warnings, intended for debugging.
• New warning control option --warning=[no-]record-size
• New command line option --keep-directory-symlink
• Fix unquoting of file names obtained via the -T option.
• Fix GNU long link header timestamp (backward compatibility).

Security issues fixed:

• CVE-2019-9923: Fixed a denial of service while parsing certain archives with malformed extended headers in pax_decode_header() (bsc#1130496).
• CVE-2018-20482: Fixed a denial of service when the '--sparse' option mishandles file shrinkage during read access (bsc#1120610).

This update for tar fixes the following issues:

Security issues fixed:

• CVE-2019-9923: Fixed a denial of service while parsing certain archives with malformed extended headers in pax_decode_header() (bsc#1130496).
• CVE-2018-20482: Fixed a denial of service when the '--sparse' option mishandles file shrinkage during read access (bsc#1120610).

This update for tar fixes the following issues:

• CVE-2021-20193: Fixed a memory leak in read_header() in list.c (bsc#1181131).

• CVE-2019-9923: Fixed a null-pointer dereference in pax_decode_header in sparse.c (bsc#1130496).

• CVE-2018-20482: Fixed infinite read loop in sparse_dump_region in sparse.c (bsc#1120610).

• Update to GNU tar 1.34:

  • Fix extraction over pipe
  • Fix memory leak in read_header (CVE-2021-20193) (bsc#1181131)
  • Fix extraction when . and .. are unreadable
  • Gracefully handle duplicate symlinks when extracting
  • Re-initialize supplementary groups when switching to user privileges

• Update to GNU tar 1.33:

  • POSIX extended format headers do not include PID by default
  • --delay-directory-restore works for archives with reversed member ordering
  • Fix extraction of a symbolic link hardlinked to another symbolic link
  • Wildcards in exclude-vcs-ignore mode don't match slash
  • Fix the --no-overwrite-dir option
  • Fix handling of chained renames in incremental backups
  • Link counting works for file names supplied with -T
  • Accept only position-sensitive (file-selection) options in file list files

• prepare usrmerge (bsc#1029961)

• Update to GNU 1.32

  • Fix the use of --checkpoint without explicit --checkpoint-action
  • Fix extraction with the -U option
  • Fix iconv usage on BSD-based systems
  • Fix possible NULL dereference (savannah bug #55369) [bsc#1130496] [CVE-2019-9923]
  • Improve the testsuite

• Update to GNU 1.31

  • Fix heap-buffer-overrun with --one-top-level, bug introduced with the addition of that option in 1.28
  • Support for zstd compression
  • New option '--zstd' instructs tar to use zstd as compression program. When listing, extractng and comparing, zstd compressed archives are recognized automatically. When '-a' option is in effect, zstd compression is selected if the destination archive name ends in '.zst' or '.tzst'.
  • The -K option interacts properly with member names given in the command line. Names of members to extract can be specified along with the '-K NAME' option. In this case, tar will extract NAME and those of named members that appear in the archive after it, which is consistent with the semantics of the option. Previous versions of tar extracted NAME, those of named members that appeared before it, and everything after it.
  • Fix CVE-2018-20482 - When creating archives with the --sparse option, previous versions of tar would loop endlessly if a sparse file had been truncated while being archived.

Chris Siebenmann discovered that tar incorrectly handled extracting files resized during extraction when invoked with the --sparse flag. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-20482)

Daniel Axtens discovered that tar incorrectly handled certain malformed tar files. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to cause tar to crash, resulting in a denial of service. (CVE-2019-9923)