Summary
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled
certain malformed unix socket names. A remote attacker could exploit this
with a crafted socket name, leading to a denial of service, or possibly
execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned
data. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous
TLS connections. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. This issue only
affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A
remote attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly
terminated TCP connections. A remote attacker could possibly use this
issue to cause an infinite loop, resulting in a denial of service.
(CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned
data. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,
CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on
the server side. A remote attacker could use this issue to cause
LibVNCServer to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A
remote attacker could use this issue to cause LibVNCServer to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages.
A remote attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service. (CVE-2020-14405)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 16.04 LTS 16.04:LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.5 |
| Ubuntu · 18.04 LTS 18.04:LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.3 |
| Ubuntu · 20.04 LTS 20.04:LTS | libvncserver | 0.9.12+dfsg-9ubuntu0.2 |
Vulnerabilities 12
-
Unscored —
libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligne…
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite loop in l…
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvn…
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint16_t pointers in libvn…
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/scale.c has a pixel_value integer overflow.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/corre.c allows out-of-bounds access via encodings.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via encodings.
-
Unscored —
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.
References
-
report
https://ubuntu.com/security/CVE-2019-20839
-
report
https://ubuntu.com/security/CVE-2019-20840
-
report
https://ubuntu.com/security/CVE-2020-14396
-
report
https://ubuntu.com/security/CVE-2020-14397
-
report
https://ubuntu.com/security/CVE-2020-14398
-
report
https://ubuntu.com/security/CVE-2020-14399
-
report
https://ubuntu.com/security/CVE-2020-14400
-
report
https://ubuntu.com/security/CVE-2020-14401
-
report
https://ubuntu.com/security/CVE-2020-14402
-
report
https://ubuntu.com/security/CVE-2020-14403
-
report
https://ubuntu.com/security/CVE-2020-14404
-
report
https://ubuntu.com/security/CVE-2020-14405