poppler: fix CVE-2025-43903

NSSCryptoSignBackend.cc in Poppler before 25.04.0 does not verify
the adbe.pkcs7.sha1 signatures on documents, resulting in potential
signature forgeries.

CVE-2025-43903-0001 is the dependent commit and
CVE-2025-43903-0002 is the actual CVE fix.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-43903

Upstream patches:
33672ca1b6
f1b9c830f1

Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-support/poppler/poppler/CVE-2025-43903-0001.patch

@@ -0,0 +1,75 @@
+From 33672ca1b6670f7378e24f6d475438f7f5d86b05 Mon Sep 17 00:00:00 2001
+From: Sune Vuorela <sune@vuorela.dk>
+Date: Mon, 22 May 2023 19:53:08 +0000
+Subject: [PATCH] Fix crash with weird hashing used for signatures
+
+CVE: CVE-2025-43903
+Upstream-Status: Backport [https://gitlab.freedesktop.org/poppler/poppler/-/commit/33672ca1b6670f7378e24f6d475438f7f5d86b05]
+
+Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
+---
+ poppler/SignatureHandler.cc | 15 ++++++++++++---
+ poppler/SignatureHandler.h  |  7 ++++++-
+ 2 files changed, 18 insertions(+), 4 deletions(-)
+
+diff --git a/poppler/SignatureHandler.cc b/poppler/SignatureHandler.cc
+index 9916300..f0b7006 100644
+--- a/poppler/SignatureHandler.cc
++++ b/poppler/SignatureHandler.cc
+@@ -768,11 +768,11 @@ SignatureVerificationHandler::SignatureVerificationHandler(std::vector<unsigned
+         SECItem usedAlgorithm = NSS_CMSSignedData_GetDigestAlgs(CMSSignedData)[0]->algorithm;
+         auto hashAlgorithm = SECOID_FindOIDTag(&usedAlgorithm);
+         HASH_HashType hashType = HASH_GetHashTypeByOidTag(hashAlgorithm);
+-        hashContext = std::make_unique<HashContext>(ConvertHashTypeFromNss(hashType));
++        hashContext = HashContext::create(ConvertHashTypeFromNss(hashType));
+     }
+ }
+
+-SignatureSignHandler::SignatureSignHandler(const std::string &certNickname, HashAlgorithm digestAlgTag) : hashContext(std::make_unique<HashContext>(digestAlgTag)), signing_cert(nullptr)
++SignatureSignHandler::SignatureSignHandler(const std::string &certNickname, HashAlgorithm digestAlgTag) : hashContext(HashContext::create(digestAlgTag)), signing_cert(nullptr)
+ {
+     SignatureHandler::setNSSDir({});
+     signing_cert = CERT_FindCertByNickname(CERT_GetDefaultCertDB(), certNickname.c_str());
+@@ -1232,7 +1232,16 @@ std::vector<unsigned char> HashContext::endHash()
+     return digestBuffer;
+ }
+
+-HashContext::HashContext(HashAlgorithm algorithm) : hash_context { HASH_Create(HASH_GetHashTypeByOidTag(ConvertHashAlgorithmToNss(algorithm))) }, digest_alg_tag(algorithm) { }
++HashContext::HashContext(HashAlgorithm algorithm, private_tag) : hash_context { HASH_Create(HASH_GetHashTypeByOidTag(ConvertHashAlgorithmToNss(algorithm))) }, digest_alg_tag(algorithm) { }
++
++std::unique_ptr<HashContext> HashContext::create(HashAlgorithm algorithm)
++{
++    auto ctx = std::make_unique<HashContext>(algorithm, private_tag {});
++    if (ctx->hash_context) {
++        return ctx;
++    }
++    return {};
++}
+
+ HashAlgorithm HashContext::getHashAlgorithm() const
+ {
+diff --git a/poppler/SignatureHandler.h b/poppler/SignatureHandler.h
+index c9fb575..f1b319f 100644
+--- a/poppler/SignatureHandler.h
++++ b/poppler/SignatureHandler.h
+@@ -51,12 +51,17 @@ static const int maxSupportedSignatureSize = 10000;
+
+ class HashContext
+ {
++    class private_tag
++    {
++    };
++
+ public:
+-    explicit HashContext(HashAlgorithm algorithm);
++    HashContext(HashAlgorithm algorithm, private_tag);
+     void updateHash(unsigned char *data_block, int data_len);
+     std::vector<unsigned char> endHash();
+     HashAlgorithm getHashAlgorithm() const;
+     ~HashContext() = default;
++    static std::unique_ptr<HashContext> create(HashAlgorithm algorithm);
+
+ private:
+     struct HashDestroyer
+--
+2.40.0

meta-oe/recipes-support/poppler/poppler/CVE-2025-43903-0002.patch

@@ -0,0 +1,49 @@
+From f1b9c830f145a0042e853d6462b2f9ca4016c669 Mon Sep 17 00:00:00 2001
+From: Juraj sarinay <juraj@sarinay.com>
+Date: Thu, 6 Mar 2025 02:02:56 +0100
+Subject: [PATCH] Properly verify adbe.pkcs7.sha1 signatures.
+
+For signatures with non-empty encapsulated content
+(typically adbe.pkcs7.sha1), we only compared hash values and
+never actually checked SignatureValue within SignerInfo.
+The bug introduced by c7c0207b1cfe49a4353d6cda93dbebef4508138f
+made trivial signature forgeries possible. Fix this by calling
+NSS_CMSSignerInfo_Verify() after the hash values compare equal.
+
+CVE: CVE-2025-43903
+Upstream-Status: Backport [https://gitlab.freedesktop.org/poppler/poppler/-/commit/f1b9c830f145a0042e853d6462b2f9ca4016c669]
+
+Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
+---
+ poppler/SignatureHandler.cc | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/poppler/SignatureHandler.cc b/poppler/SignatureHandler.cc
+index 9916300..5c478bc 100644
+--- a/poppler/SignatureHandler.cc
++++ b/poppler/SignatureHandler.cc
+@@ -934,13 +934,20 @@ SignatureValidationStatus SignatureVerificationHandler::validateSignature()
+           This means it's not a detached type signature
+           so the digest is contained in SignedData->contentInfo
+         */
+-        if (digest.len == content_info_data->len && memcmp(digest.data, content_info_data->data, digest.len) == 0) {
++        if (digest.len != content_info_data->len || memcmp(digest.data, content_info_data->data, digest.len) != 0) {
+             return SIGNATURE_VALID;
+         } else {
+             return SIGNATURE_DIGEST_MISMATCH;
+         }
+
+-    } else if (NSS_CMSSignerInfo_Verify(CMSSignerInfo, &digest, nullptr) != SECSuccess) {
++        auto innerHashContext = HashContext::create(hashContext->getHashAlgorithm());
++        innerHashContext->updateHash(content_info_data->data, content_info_data->len);
++        digest_buffer = innerHashContext->endHash();
++        digest.data = digest_buffer.data();
++        digest.len = digest_buffer.size();
++    }
++
++    if (NSS_CMSSignerInfo_Verify(CMSSignerInfo, &digest, nullptr) != SECSuccess) {
+         return NSS_SigTranslate(CMSSignerInfo->verificationStatus);
+     } else {
+         return SIGNATURE_VALID;
+--
+2.40.0

meta-oe/recipes-support/poppler/poppler_23.04.0.bb

@@ -14,6 +14,8 @@ SRC_URI = "http://poppler.freedesktop.org/${BP}.tar.xz \
            file://CVE-2024-56378.patch \
            file://CVE-2025-32364.patch \
            file://CVE-2025-32365.patch \
+           file://CVE-2025-43903-0001.patch \
+           file://CVE-2025-43903-0002.patch \
            "
 SRC_URI[sha256sum] = "b6d893dc7dcd4138b9e9df59a13c59695e50e80dc5c2cacee0674670693951a1"