[ubuntu/noble-security] libgcrypt20 1.10.3-2ubuntu0.2 (Accepted)

[Marc Deslauriers]

libgcrypt20 (1.10.3-2ubuntu0.2) noble-security; urgency=medium

  * SECURITY UPDATE: timing-based side-channel flaw in RSA implementation
    - debian/patches/CVE-2024-2236-1.patch: rsa: Do not accept invalid PKCS#1.5
      padding when deciphering in cipher/rsa-common.c, src/const-time.h.
    - debian/patches/CVE-2024-2236-2.patch: rsa: Constant time blinding removal
      in cipher/rsa.c, configure.ac, mpi/Makefile.am, mpi/mpi-internal.h,
      mpi/mpi-mul-cs.c, mpi/mpi-mul.c, src/gcrypt-int.h.
    - debian/patches/CVE-2024-2236-3.patch: Constant time conversion of the
      message to the SEXP in cipher/rsa.c, src/const-time.c, src/const-time.h,
      src/sexp.c.
    - debian/patches/CVE-2024-2236-4.patch: rsa: Implement constant-time
      conversion of MPI to string in cipher/rsa-common.c.
    - debian/patches/CVE-2024-2236-5.patch: cipher: Use the constant time
      conversion also for OAEP in cipher/rsa-common.c, cipher/rsa.c.
    - debian/patches/CVE-2024-2236-6.patch: Implement implicit rejection for
      PKCS#1.5 decipher in cipher/pubkey-internal.h, cipher/pubkey-util.c,
      cipher/rsa-common.c, cipher/rsa.c, src/cipher.h, src/const-time.c,
      src/const-time.h, tests/pkcs1v2-v15c.h, tests/pkcs1v2.c.
    - debian/rules: build with --enable-marvin-workaround.
    - Thanks for Red Hat for the patches!
    - CVE-2024-2236

Date: 2026-08-25 19:14:38.058007+00:00
Changed-By: Marc Deslauriers <marc.deslauriers at canonical.com>
https://launchpad.net/ubuntu/+source/libgcrypt20/1.10.3-2ubuntu0.2
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