CVE-2011-1096 in JBoss Enterprise Portal Platform
Summary
by MITRE
The W3C XML Encryption Standard, as used in the JBoss Web Services (JBossWS) component in JBoss Enterprise Portal Platform before 5.2.2 and other products, when using block ciphers in cipher-block chaining (CBC) mode, allows remote attackers to obtain plaintext data via a chosen-ciphertext attack on SOAP responses, aka "character encoding pattern attack."
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Analysis
by VulDB Data Team • 12/20/2021
The vulnerability described in CVE-2011-1096 represents a critical flaw in the implementation of the W3C XML Encryption Standard within JBoss Web Services component. This weakness specifically manifests when block ciphers operate in cipher-block chaining mode, creating a scenario where remote attackers can exploit the encryption implementation to recover plaintext data from SOAP responses. The vulnerability stems from insufficient protection mechanisms that fail to properly handle chosen-ciphertext attacks, allowing adversaries to systematically deduce sensitive information through carefully crafted input patterns.
The technical flaw exploits a fundamental weakness in the encryption protocol implementation where the cipher-block chaining mode does not adequately protect against adaptive chosen-ciphertext attacks. This allows attackers to manipulate ciphertext values and observe corresponding changes in the decrypted output, ultimately enabling them to reconstruct the original plaintext data. The attack leverages the predictable nature of CBC mode encryption where each ciphertext block influences the next decryption operation, creating exploitable patterns that can be systematically analyzed. The vulnerability specifically affects JBoss Enterprise Portal Platform versions prior to 5.2.2 and extends to other products implementing similar encryption mechanisms, making it a widespread concern across various enterprise environments.
Operationally, this vulnerability presents a severe risk to organizations relying on JBossWS for secure communications, as it allows attackers to extract sensitive data from SOAP messages without requiring authentication or direct access to the encryption keys. The character encoding pattern attack technique enables adversaries to systematically reverse-engineer plaintext content through multiple attack iterations, potentially exposing confidential business data, user credentials, or proprietary information. The remote nature of the attack means that threat actors can exploit this vulnerability from outside the network perimeter, making it particularly dangerous for organizations with exposed web services. This weakness directly impacts the confidentiality aspect of the CIA triad and can lead to significant data breaches and compliance violations.
Mitigation strategies for CVE-2011-1096 should prioritize immediate patching of affected JBoss Enterprise Portal Platform versions to 5.2.2 or later, where the vulnerability has been addressed through improved encryption implementation. Organizations should also consider implementing additional security controls such as input validation and output encoding to prevent exploitation attempts, while ensuring proper key management practices are followed. The fix typically involves strengthening the encryption protocol to prevent chosen-ciphertext attacks by implementing proper padding schemes and ensuring that the encryption implementation properly handles all possible ciphertext inputs. Security teams should also monitor for similar vulnerabilities in other encryption implementations and consider adopting more robust encryption standards that are resistant to such attacks. This vulnerability aligns with CWE-310 and relates to ATT&CK technique T1552.004, highlighting the importance of proper cryptographic implementation and the potential for data exfiltration through encryption weaknesses.