Package: release.debian.org
Severity: normal
Tags: bookworm
X-Debbugs-Cc: libt...@packages.debian.org
Control: affects -1 + src:libtpms
User: release.debian....@packages.debian.org
Usertags: pu
Fixes a low severity security issue. The identical patch has
been applied in unstable for quite a while and all the autopkgtests
with rev deps as triggered with desusine also looked good. Debdiff
below.
Cheers,
Moritz
diff -Nru libtpms-0.9.2/debian/changelog libtpms-0.9.2/debian/changelog
--- libtpms-0.9.2/debian/changelog 2023-03-07 22:32:00.000000000 +0100
+++ libtpms-0.9.2/debian/changelog 2025-08-25 22:42:00.000000000 +0200
@@ -1,3 +1,9 @@
+libtpms (0.9.2-3.1+deb12u1) bookworm; urgency=medium
+
+ * CVE-2025-49133 (Closes: #1107617)
+
+ -- Moritz Mühlenhoff <j...@debian.org> Mon, 25 Aug 2025 22:42:00 +0200
+
libtpms (0.9.2-3.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru libtpms-0.9.2/debian/patches/CVE-2025-49133.patch
libtpms-0.9.2/debian/patches/CVE-2025-49133.patch
--- libtpms-0.9.2/debian/patches/CVE-2025-49133.patch 1970-01-01
01:00:00.000000000 +0100
+++ libtpms-0.9.2/debian/patches/CVE-2025-49133.patch 2025-08-25
22:41:56.000000000 +0200
@@ -0,0 +1,256 @@
+Origin: upstream, 9f9baccdba9cd3fc32f1355613abd094b21f7ba0
+From: Stefan Berger <stef...@linux.ibm.com>
+Date: Tue, 9 Jul 2024 16:45:42 -0400
+Subject: tpm2: Fix potential out-of-bound access & abort due to HMAC signing
issue
+
+Fix an HMAC signing issue that may causes an out-of-bounds access in a
+TPM2B that in turn was running into an assert() in libtpms causing an
+abort. The signing issue was due to an inconsistent pairing of the signKey
+and signScheme parameters, where the signKey is ALG_KEYEDHASH key and
+inScheme is an ECC or RSA scheme.
+
+This fixes CVE-2025-49133.
+
+--- libtpms-0.9.2.orig/src/tpm2/CryptUtil.c
++++ libtpms-0.9.2/src/tpm2/CryptUtil.c
+@@ -67,7 +67,7 @@
+ #include "Tpm.h"
+ /* 10.2.6.3 Hash/HMAC Functions */
+ /* 10.2.6.3.1 CryptHmacSign() */
+-/* Sign a digest using an HMAC key. This an HMAC of a digest, not an HMAC of
a message. */
++/* Sign a digest using an HMAC key. This is an HMAC of a digest, not an HMAC
of a message. */
+ /* Error Returns Meaning */
+ /* TPM_RC_HASH not a valid hash */
+ static TPM_RC
+@@ -79,12 +79,18 @@ CryptHmacSign(
+ {
+ HMAC_STATE hmacState;
+ UINT32 digestSize;
+- digestSize = CryptHmacStart2B(&hmacState,
signature->signature.any.hashAlg,
+- &signKey->sensitive.sensitive.bits.b);
+- CryptDigestUpdate2B(&hmacState.hashState, &hashData->b);
+- CryptHmacEnd(&hmacState, digestSize,
+- (BYTE *)&signature->signature.hmac.digest);
+- return TPM_RC_SUCCESS;
++
++ if(signature->sigAlg == TPM_ALG_HMAC)
++ {
++ digestSize = CryptHmacStart2B(&hmacState,
++ signature->signature.any.hashAlg,
++ &signKey->sensitive.sensitive.bits.b);
++ CryptDigestUpdate2B(&hmacState.hashState, &hashData->b);
++ CryptHmacEnd(&hmacState, digestSize,
++ (BYTE *)&signature->signature.hmac.digest);
++ return TPM_RC_SUCCESS;
++ }
++ return TPM_RC_SCHEME;
+ }
+ /* 10.2.6.3.2 CryptHMACVerifySignature() */
+ /* This function will verify a signature signed by a HMAC key. Note that a
caller needs to prepare
+@@ -1096,7 +1102,7 @@ CryptIsSplitSign(
+ }
+ }
+ /* 10.2.6.6.11 CryptIsAsymSignScheme() */
+-/* This function indicates if a scheme algorithm is a sign algorithm. */
++/* This function indicates if a scheme algorithm is a sign algorithm valid
for the public key type. */
+ BOOL
+ CryptIsAsymSignScheme(
+ TPMI_ALG_PUBLIC publicType, // IN: Type
of the object
+@@ -1125,9 +1131,11 @@ CryptIsAsymSignScheme(
+ #if ALG_ECC
+ // If ECC is implemented ECDSA is required
+ case TPM_ALG_ECC:
++# if !ALG_ECDSA
++# error "ECDSA required if ECC enabled."
++# endif
+ switch(scheme)
+ {
+- // Support for ECDSA is required for ECC
+ case TPM_ALG_ECDSA:
+ #if ALG_ECDAA // ECDAA is optional
+ case TPM_ALG_ECDAA:
+@@ -1151,6 +1159,58 @@ CryptIsAsymSignScheme(
+ }
+ return isSignScheme;
+ }
++//*** CryptIsValidSignScheme()
++// This function checks that a signing scheme is valid. This includes
verifying
++// that the scheme signing algorithm is compatible with the signing object
type
++// and that the scheme specifies a valid hash algorithm.
++static BOOL CryptIsValidSignScheme(TPMI_ALG_PUBLIC publicType, // IN: Type
of the object
++ TPMT_SIG_SCHEME* scheme // IN: the
signing scheme
++)
++{
++ BOOL isValidSignScheme = TRUE;
++
++ switch(publicType)
++ {
++#if ALG_RSA
++ case TPM_ALG_RSA:
++ isValidSignScheme = CryptIsAsymSignScheme(publicType,
scheme->scheme);
++ break;
++#endif // ALG_RSA
++
++#if ALG_ECC
++ case TPM_ALG_ECC:
++ isValidSignScheme = CryptIsAsymSignScheme(publicType,
scheme->scheme);
++ break;
++#endif // ALG_ECC
++
++ case TPM_ALG_KEYEDHASH:
++ if(scheme->scheme != TPM_ALG_HMAC)
++ {
++ isValidSignScheme = FALSE;
++ }
++ break;
++
++ default:
++ isValidSignScheme = FALSE;
++ break;
++ }
++
++ // Ensure that a valid hash algorithm is specified. Pass 'flag' = FALSE to
++ // indicate that TPM_ALG_NULL should not be treated as valid.
++ //
++ // NOTE: 'details' is of type TPMU_SIG_SCHEME which is a union of many
++ // different signature scheme types. In all these types (including the
type
++ // of 'any'), the very first member is of type TPMI_ALG_HASH. Therefore,
++ // when 'any.hashAlg' is set to a valid hash algorithm ID, the hash for
any
++ // signature scheme type will also be a valid hash algorithm ID. (All
valid
++ // hash algorithm IDs are the same for all signature scheme types.)
++ if(!CryptHashIsValidAlg(scheme->details.any.hashAlg, /* flag = */ FALSE))
++ {
++ isValidSignScheme = FALSE;
++ }
++
++ return isValidSignScheme;
++}
+ /* 10.2.6.6.12 CryptIsAsymDecryptScheme() */
+ /* This function indicate if a scheme algorithm is a decrypt algorithm. */
+ BOOL
+@@ -1205,8 +1265,9 @@ CryptIsAsymDecryptScheme(
+ }
+ /* 10.2.6.6.13 CryptSelectSignScheme() */
+ /* This function is used by the attestation and signing commands. It
implements the rules for
+- selecting the signature scheme to use in signing. This function requires
that the signing key
+- either be TPM_RH_NULL or be loaded. */
++ selecting the signature scheme to use in signing and validates that the
selected scheme is
++ compatible with the key type. It also ensures the selected scheme
specifies a valid hash
++ algorithm. This function requires that the signing key either be
TPM_RH_NULL or be loaded. */
+ /* If a default scheme is defined in object, the default scheme should be
chosen, otherwise, the
+ input scheme should be chosen. In the case that both object and input
scheme has a non-NULL
+ scheme algorithm, if the schemes are compatible, the input scheme will be
chosen. */
+@@ -1237,25 +1298,32 @@ CryptSelectSignScheme(
+ {
+ // assignment to save typing.
+ publicArea = &signObject->publicArea;
+- // A symmetric cipher can be used to encrypt and decrypt but it
can't
+- // be used for signing
+- if(publicArea->type == TPM_ALG_SYMCIPHER)
+- return FALSE;
+- // Point to the scheme object
++
++ // Get a point to the scheme object
+ if(CryptIsAsymAlgorithm(publicArea->type))
+- objectScheme =
+- (TPMT_SIG_SCHEME
*)&publicArea->parameters.asymDetail.scheme;
++ {
++ objectScheme =
++ (TPMT_SIG_SCHEME
*)&publicArea->parameters.asymDetail.scheme;
++ }
++ else if(publicArea->type == TPM_ALG_KEYEDHASH)
++ {
++ objectScheme =
++ (TPMT_SIG_SCHEME
*)&publicArea->parameters.keyedHashDetail.scheme;
++ }
+ else
+- objectScheme =
+- (TPMT_SIG_SCHEME
*)&publicArea->parameters.keyedHashDetail.scheme;
++ {
++ // Only asymmetric key types (RSA, ECC) and keyed hashes
can be
++ // used for signing. A symmetric cipher can be used to
encrypt and
++ // decrypt but can't be used for signing.
++ return FALSE;
++ }
++
+ // If the object doesn't have a default scheme, then use the
+ // input scheme.
+ if(objectScheme->scheme == TPM_ALG_NULL)
+ {
+ // Input and default can't both be NULL
+ OK = (scheme->scheme != TPM_ALG_NULL);
+- // Assume that the scheme is compatible with the key. If
not,
+- // an error will be generated in the signing operation.
+ }
+ else if(scheme->scheme == TPM_ALG_NULL)
+ {
+@@ -1282,6 +1350,13 @@ CryptSelectSignScheme(
+ && (objectScheme->details.any.hashAlg
+ == scheme->details.any.hashAlg);
+ }
++
++ if(OK)
++ {
++ // Check that the scheme is compatible with the key type
and has a
++ // valid hash algorithm specified.
++ OK = CryptIsValidSignScheme(publicArea->type, scheme);
++ }
+ }
+ return OK;
+ }
+--- libtpms-0.9.2.orig/src/tpm2/SigningCommands.c
++++ libtpms-0.9.2/src/tpm2/SigningCommands.c
+@@ -116,16 +116,23 @@ TPM2_Sign(
+ //
+ // Input Validation
+ if(!IsSigningObject(signObject))
++ {
+ return TPM_RCS_KEY + RC_Sign_keyHandle;
++ }
+
+ // A key that will be used for x.509 signatures can't be used in
TPM2_Sign().
+ if(IS_ATTRIBUTE(signObject->publicArea.objectAttributes, TPMA_OBJECT,
x509sign))
++ {
+ return TPM_RCS_ATTRIBUTES + RC_Sign_keyHandle;
++ }
+
+- // pick a scheme for sign. If the input sign scheme is not compatible
with
+- // the default scheme, return an error.
++ // Pick a scheme for signing. If the input signing scheme is not
compatible
++ // with the default scheme or the signing key type, return an error. If a
++ // valid hash algorithm is not specified, return an error.
+ if(!CryptSelectSignScheme(signObject, &in->inScheme))
++ {
+ return TPM_RCS_SCHEME + RC_Sign_inScheme;
++ }
+ // If validation is provided, or the key is restricted, check the ticket
+ if(in->validation.digest.t.size != 0
+ || IS_ATTRIBUTE(signObject->publicArea.objectAttributes, TPMA_OBJECT,
restricted))
+--- libtpms-0.9.2.orig/src/tpm2/crypto/CryptHash_fp.h
++++ libtpms-0.9.2/src/tpm2/crypto/CryptHash_fp.h
+@@ -77,7 +77,7 @@ CryptGetHashDef(
+ BOOL
+ CryptHashIsValidAlg(
+ TPM_ALG_ID hashAlg,
+- BOOL flag
++ BOOL isAlgNullValid
+ );
+ LIB_EXPORT TPM_ALG_ID
+ CryptHashGetAlgByIndex(
+--- libtpms-0.9.2.orig/src/tpm2/crypto/openssl/CryptHash.c
++++ libtpms-0.9.2/src/tpm2/crypto/openssl/CryptHash.c
+@@ -139,12 +139,12 @@ CryptGetHashDef(
+ BOOL
+ CryptHashIsValidAlg(
+ TPM_ALG_ID hashAlg, // IN: the algorithm to
check
+- BOOL flag // IN: TRUE if
TPM_ALG_NULL is to be treated
++ BOOL isAlgNullValid // IN: TRUE if
TPM_ALG_NULL is to be treated
+ // as a valid hash
+ )
+ {
+ if(hashAlg == TPM_ALG_NULL)
+- return flag;
++ return isAlgNullValid;
+ return CryptGetHashDef(hashAlg) != &NULL_Def;
+ }
+ /* 10.2.13.4.4 CryptHashGetAlgByIndex() */
diff -Nru libtpms-0.9.2/debian/patches/series
libtpms-0.9.2/debian/patches/series
--- libtpms-0.9.2/debian/patches/series 2023-03-07 22:32:00.000000000 +0100
+++ libtpms-0.9.2/debian/patches/series 2025-08-25 22:41:38.000000000 +0200
@@ -3,3 +3,4 @@
do_not_inline_makeiv.patch
no_local_check.patch
tpm2-Check-size-of-buffer-before-accessing-it-CVE-20.patch
+CVE-2025-49133.patch
