Security Bulletin: Vulnerabilities in TigerVNC affect PowerKVM

Vulnerability Details

CVEID: CVE-2017-7396
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by a memory leak in the CConnection::CConnection function in CConnection.cxx. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause the application to stop responding.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124254 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-7395
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by an integer overflow in the SMsgReader::readClientCutText function in SMsgReader.cxx. By sending a specially crafted request, a remote authenticated attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124253 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-7394
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by a flaw in the SSecurityPlain::processMsg function in SSecurityPlain.cxx. By sending a specially crafted username, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124252 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-7393
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by a double free overflow in the VNCSConnectionST::fence function in VNCSConnectionST.cxx. By sending a specially crafted request, a remote authenticated attacker could exploit this vulnerability to cause the application to crash or execute arbitrary code on the system.
CVSS Base Score: 6.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124251 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)

CVEID: CVE-2017-7392
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by a memory leak in the SSecurityVeNCrypt::SSecurityVeNCrypt function in SSecurityVeNCrypt.cxx. By sending a specially crafted request, a remote attacker could exploit this vulnerability to exhaust server memory.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124250 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-5581
DESCRIPTION: TigerVNC is vulnerable to a buffer overflow, caused by improper bounds checking by the ModifiablePixelBuffer::fillRect function. By using an RRE message with subrectangle outside framebuffer boundaries, a remote attacker could overflow a buffer and execute arbitrary code on the system.
CVSS Base Score: 7.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/123340 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

CVEID: CVE-2016-10207
DESCRIPTION: TigerVNC is vulnerable to a denial of service, caused by a flaw in the Xvnc server. By terminating a TLS handshake early, a remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/123342 for the current score
CVSS Environmental Score*: Undefined