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CVE-2018-20547

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0...

8.1 HighFix available

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
High

Exploit likelihood

1.80%Up 0.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
CVE-2018-20547
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
CVSS 2.0
5.8 MediumAV:N/AC:M/Au:N/C:P/I:N/A:P
Weakness
CWE-119
Updated
2026-11-02
CVE List No score

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
CVE-2018-20547
Updated
2026-11-02
EUVDEUVD-2018-13101 No score

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
EUVD-2018-13101
Updated
2026-11-03
GitHub AdvisoriesGHSA-m74g-vjwg-c8rp 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0...

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
GHSA-m74g-vjwg-c8rp
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Weakness
CWE-119
Updated
2026-11-02
OSVALPINE-CVE-2018-20547 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
ALPINE-CVE-2018-20547
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-03
OSV 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
CVE-2018-20547
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
Show 9 moreShow less
OSVDEBIAN-CVE-2018-20547 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
DEBIAN-CVE-2018-20547
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-20547 8.1

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for 24bpp data.

Record
UBUNTU-CVE-2018-20547
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVMGASA-2019-0050 No score

Updated libcaca packages fix security vulnerabilities

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to cause a denial of service (CVE-2018-20544).

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to execute arbitrary code (CVE-2018-20545, CVE-2018-20548, CVE-2018-20459).

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to access sensitive information (CVE-2018-20546, CVE-2018-20547).

Record
MGASA-2019-0050
Updated
2026-11-02
OSVopenSUSE-SU-2019:1144-1 No score

Security update for libcaca

This update for libcaca fixes the following issues:

Security issues fixed:

  • CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502)
  • CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584)
  • CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503)
  • CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504)
  • CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589)
  • CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470)

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

Record
openSUSE-SU-2019:1144-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:12537-1 No score

caca-utils-0.99.beta20-1.1 on GA media

These are all security issues fixed in the caca-utils-0.99.beta20-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:12537-1
Updated
2026-11-02
OSVSUSE-SU-2019:0770-1 No score

Security update for libcaca

This update for libcaca fixes the following issues:

Security issues fixed:

  • CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502)
  • CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584)
  • CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503)
  • CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504)
  • CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589)
  • CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470)
Record
SUSE-SU-2019:0770-1
Updated
2026-11-02
OSVSUSE-SU-2019:2745-1 No score

Security update for libcaca

This update for libcaca fixes the following issues:

Security issues fixed:

  • CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502)
  • CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584)
  • CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503)
  • CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504)
  • CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589)
  • CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470)
Record
SUSE-SU-2019:2745-1
Updated
2026-11-02
OSVSUSE-SU-2019:2745-2 No score

Security update for libcaca

This update for libcaca fixes the following issues:

Security issues fixed:

  • CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502)
  • CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584)
  • CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503)
  • CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504)
  • CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589)
  • CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470)
Record
SUSE-SU-2019:2745-2
Updated
2026-11-02
OSVUSN-3860-1 No score

libcaca vulnerabilities

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-20544)

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to execute arbitrary code. (CVE-2018-20545, CVE-2018-20548, CVE-2018-20459)

It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to access sensitive information. (CVE-2018-20546, CVE-2018-20547)

Record
USN-3860-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libcaca
Alpine:v3.10
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.11
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.12
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.13
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.14
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.15
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.16
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.17
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.18
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.19
 before 0.99_beta19-r3
0.99_beta19-r3
Show 25 moreShow less
Affected packages
PackageAffectedFixed
libcaca
Alpine:v3.20
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.21
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.22
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.23
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Alpine:v3.24
 before 0.99_beta19-r3
0.99_beta19-r3
libcaca
Debian:12
 before 0.99.beta19-2.1
0.99.beta19-2.1
libcaca
Debian:13
 before 0.99.beta19-2.1
0.99.beta19-2.1
libcaca
Debian:14
 before 0.99.beta19-2.1
0.99.beta19-2.1
libcaca
Debian:8
From an advisory covering 4 CVEs
 before 0.99.beta19-2+deb8u1, plus listed versions
0.99.beta19-2
0.99.beta19-2+deb8u1
libcaca
Mageia:6
From an advisory covering 6 CVEs
 before 0.99-0.beta18.13.1.mga6
0.99-0.beta18.13.1.mga6
libcaca
SUSE:Linux Enterprise Module for Server Applications 15
From an advisory covering 6 CVEs
 before 0.99.beta19.git20171003-3.3.7
0.99.beta19.git20171003-3.3.7
libcaca
SUSE:Linux Enterprise Desktop 12 SP4
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Software Development Kit 12 SP4
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Server 12 SP4
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 6 CVEs
 before 0.99.beta18-14.3.27
0.99.beta18-14.3.27
libcaca
Ubuntu:14.04:LTS
 before 0.99.beta18-1ubuntu5.1, plus listed versions
0.99.beta18-1ubuntu20.99.beta18-1ubuntu30.99.beta18-1ubuntu40.99.beta18-1ubuntu5
0.99.beta18-1ubuntu5.1
libcaca
Ubuntu:16.04:LTS
 before 0.99.beta19-2ubuntu0.16.04.1, plus listed versions
0.99.beta19-2build2~gcc5.10.99.beta19-2build2~gcc5.2
0.99.beta19-2ubuntu0.16.04.1
libcaca
Ubuntu:18.04:LTS
 before 0.99.beta19-2ubuntu0.18.04.1, plus listed versions
0.99.beta19-2build2~gcc5.20.99.beta19-2build2~gcc5.3
0.99.beta19-2ubuntu0.18.04.1
libcaca
Ubuntu:14.04:LTS
From an advisory covering 6 CVEs
 before 0.99.beta18-1ubuntu5.1, plus listed versions
0.99.beta18-1ubuntu20.99.beta18-1ubuntu30.99.beta18-1ubuntu40.99.beta18-1ubuntu5
0.99.beta18-1ubuntu5.1
libcaca
Ubuntu:16.04:LTS
From an advisory covering 6 CVEs
 before 0.99.beta19-2ubuntu0.16.04.1, plus listed versions
0.99.beta19-2build2~gcc5.10.99.beta19-2build2~gcc5.2
0.99.beta19-2ubuntu0.16.04.1
libcaca
Ubuntu:18.04:LTS
From an advisory covering 6 CVEs
 before 0.99.beta19-2ubuntu0.18.04.1, plus listed versions
0.99.beta19-2build2~gcc5.20.99.beta19-2build2~gcc5.3
0.99.beta19-2ubuntu0.18.04.1
libcaca
openSUSE:Leap 15.0
From an advisory covering 6 CVEs
 before 0.99.beta19.git20171003-lp150.2.3.1
0.99.beta19.git20171003-lp150.2.3.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-20547 is a high vulnerability (CVSS 8.1) in Libcaca Project Libcaca, published December 28, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.80%, the 78th percentile. Fixed in libcaca 0.99_beta19-r3.

References

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