CVE-2018-15126

LibVNC before commit 73cb96fec028a576a5a24417b57723b55854ad7b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution

A heap use-after-free vulnerability in the server code of the file transfer extension, which can result in remote code execution. This attack appears to be exploitable via network connectivity (CVE-2018-6307).

A heap use-after-free vulnerability in the server code of the file transfer extension, which can result in remote code execution. This attack appears to be exploitable via network connectivity (CVE-2018-15126).

A heap out-of-bound write vulnerability in the server code of the file transfer extension, which can result in remote code execution. This attack appears to be exploitable via network connectivity (CVE-2018-15127).

Multiple heap out-of-bound write vulnerabilities in VNC client code, which can result in remote code execution (CVE-2018-20019).

Heap out-of-bound write vulnerability in a structure in VNC client code, which can result in remote code execution (CVE-2018-20020).

Infinite Loop vulnerability in VNC client code. The vulnerability could allow an attacker to consume an excessive amount of resources, such as CPU and RAM (CVE-2018-20021).

Improper Initialization weaknesses in VNC client code, which could allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and bypass ASLR (CVE-2018-20022).

Improper Initialization vulnerability in VNC Repeater client code, which could allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and bypass ASLR (CVE-2018-20023).

A null pointer dereference in VNC client code, which can result in DoS (CVE-2018-20024).

This update for LibVNCServer fixes the following issues:

Security issues fixed:

• CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)
• CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)
• CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)
• CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)
• CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)
• CVE-2018-20023: Fixed information disclosure through improper initialization in VNC Repeater client code (bsc#1120119)
• CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)
• CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)
• CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the LibVNCServer-devel-0.9.13-3.1 package on the GA media of openSUSE Tumbleweed.

This update for LibVNCServer fixes the following issues:

Security issues fixed:

• CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)
• CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)
• CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)
• CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)
• CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)
• CVE-2018-20023: Fixed information disclosure through improper initialization in VNC Repeater client code (bsc#1120119)
• CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)
• CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)
• CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

This update for LibVNCServer fixes the following issues:

Security issues fixed:

• CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)
• CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)
• CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)
• CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)
• CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)
• CVE-2018-20023: Fixed information disclosure through improper initialization in VNC Repeater client code (bsc#1120119)
• CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)
• CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)
• CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

This update for LibVNCServer fixes the following issues:

Security issues fixed:

• CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)
• CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)
• CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)
• CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)
• CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)
• CVE-2018-20023: Fixed information disclosure through improper initialization in VNC Repeater client code (bsc#1120119)
• CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)
• CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)
• CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

This update for LibVNCServer fixes the following issues:

Security issues fixed:

• CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)
• CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)
• CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)
• CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)
• CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)
• CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)
• CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)
• CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

It was discovered that LibVNCServer incorrectly handled certain operations. A remote attacker able to connect to applications using LibVNCServer could possibly use this issue to obtain sensitive information, cause a denial of service, or execute arbitrary code.