Blue Coat ProxySG 6.5.x < 18.104.22.168 / 6.6.x < 22.214.171.124 Multiple OpenSSL Vulnerabilities
Critical Nessus Plugin ID 93381
SynopsisThe remote device is affected by multiple vulnerabilities.
DescriptionThe self-reported SGOS version installed on the remote Blue Coat ProxySG device is 6.5.x prior to 126.96.36.199 or 6.6.x prior to 188.8.131.52. It is, therefore, affected by multiple vulnerabilities in its bundled version of OpenSSL :
- Multiple flaws exist in the aesni_cbc_hmac_sha1_cipher() function in file crypto/evp/e_aes_cbc_hmac_sha1.c and the aesni_cbc_hmac_sha256_cipher() function in file crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered when the connection uses an AES-CBC cipher and AES-NI is supported by the server. A man-in-the-middle attacker can exploit these to conduct a padding oracle attack, resulting in the ability to decrypt the network traffic.
Note that this issue does not affect the SG300 and SG600 hardware platforms. (CVE-2016-2107)
- A remote code execution vulnerability exists in the ASN.1 encoder due to an underflow condition that occurs when attempting to encode the value zero represented as a negative integer. An unauthenticated, remote attacker can exploit this to corrupt memory, resulting in the execution of arbitrary code. (CVE-2016-2108)
- Multiple unspecified flaws exist in the d2i BIO functions when reading ASN.1 data from a BIO due to invalid encoding causing a large allocation of memory.
An unauthenticated, remote attacker can exploit these to cause a denial of service condition through resource exhaustion. Note that this issue only affects management connections. (CVE-2016-2109)
SolutionUpgrade to Blue Coat SGOS version 184.108.40.206 / 220.127.116.11 or later.