CVE-2023-29491

ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo or reached via the TERMINFO or TERM environment variable.

ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo or reached via the TERMINFO or TERM environment variable.

The ncurses (new curses) library is a free software emulation of curses in System V Release 4.0 (SVr4), and more. It uses terminfo format, supports pads and color and multiple highlights and forms characters and function-key mapping, and has all the other SVr4-curses enhancements over BSD curses. SVr4 curses became the basis of X/Open Curses.

Security Fix(es):

ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo or reached via the TERMINFO or TERM environment variable.(CVE-2023-29491)

ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo or reached via the TERMINFO or TERM environment variable.

The ncurses (new curses) library routines are a terminal-independent method of updating character screens with reasonable optimization. The ncurses packages contain support utilities including a terminfo compiler tic, a decompiler infocmp, clear, tput, tset, and a termcap conversion tool captoinfo.

Security Fix(es):

• ncurses: Local users can trigger security-relevant memory corruption via malformed data (CVE-2023-29491)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The ncurses (new curses) library routines are a terminal-independent method of updating character screens with reasonable optimization. The ncurses packages contain support utilities including a terminfo compiler tic, a decompiler infocmp, clear, tput, tset, and a termcap conversion tool captoinfo.

Security Fix(es):

• ncurses: Local users can trigger security-relevant memory corruption via malformed data (CVE-2023-29491)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• CVE-2023-29491.patch: Mitigate vulnerability by building the packages with modified --disable-root-environ option which now limits usage of environment for setuid/setgid programs only
• CVE-2021-39537.patch: Add a check for end-of-string in cvtchar to handle a malformed string in infotocap

• CVE-2023-29491: fix triggering memory corruption via malformed terminfo database file when used by a setuid application

• CVE-2021-39537: fix heap buffer overflow in _nc_captoinfo() with a crafted termcap entry
• CVE-2023-29491: ignore terminfo/termcap environment variables in setuid/setgid programs (--disable-root-environ)

ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo or reached via the TERMINFO or TERM environment variable.

The updated packages fix a security vulnerability: Local users can trigger security-relevant memory corruption via malformed data. (CVE-2023-29491)

This update for ncurses fixes the following issues:

• CVE-2023-29491: Fixed memory corruption issues when processing malformed terminfo data (bsc#1210434).

This update for ncurses fixes the following issues:

• CVE-2023-29491: Fixed memory corruption issues when processing malformed terminfo data (bsc#1210434).

It was discovered that ncurses was incorrectly performing bounds checks when processing invalid hashcodes. An attacker could possibly use this issue to cause a denial of service or to expose sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-17594)

It was discovered that ncurses was incorrectly handling end-of-string characters when processing terminfo and termcap files. An attacker could possibly use this issue to cause a denial of service or to expose sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-17595)

It was discovered that ncurses was incorrectly handling end-of-string characters when converting between termcap and terminfo formats. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-39537)

It was discovered that ncurses was incorrectly performing bounds checks when dealing with corrupt terminfo data while reading a terminfo file. An attacker could possibly use this issue to cause a denial of service or to expose sensitive information. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-29458)

It was discovered that ncurses was parsing environment variables when running with setuid applications and not properly handling the processing of malformed data when doing so. A local attacker could possibly use this issue to cause a denial of service (application crash) or execute arbitrary code. (CVE-2023-29491)