CVE-2020-24240

GNU Bison before 3.7.1 has a use-after-free in obstackfree in lib/obstack.c called from gramlex when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug...

CVE-2020-24240

GNU Bison before 3.7.1 has a use-after-free in obstackfree in lib/obstack.c called from gramlex when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug...

Use After Free

GNU Bison has a use-after-free in obstackfree in lib/obstack.c called from gramlex when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was...

CVE-2020-24240: Use After Free

GNU Bison before 3.7.1 has a use-after-free in obstackfree in lib/obstack.c called from gramlex when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug...

PT-2020-15669

Name of the Vulnerable Software and Affected Versions GNU Bison versions prior to 3.7.1 Description The issue arises from a use-after-free in obstack free in lib/obstack.c, which is called from gram lex, when a '0' byte is encountered. This poses a risk only if GNU Bison is used with untrusted...

SecGen - Create Randomly Insecure VMs

SecGen creates vulnerable virtual machines, lab environments, and hacking challenges, so students can learn security penetration testing techniques. Boxes like Metasploitable2 are always the same, this project uses Vagrant, Puppet, and Ruby to create randomly vulnerable virtual machines that can ...

An issue was discovered in GNU Binutils 2.32. It is a heap-based buffer overflow in process_mips_specific in readelf.c via a malformed MIPS option section.

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In the GNU C Library (aka glibc or libc6) through 2.29 check_dst_limits_calc_pos_1 in posix/regexec.c has Uncontrolled Recursion as demonstrated by '(\227|)(\\1\\1|t1|\\\2537)+' in grep.

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An issue was discovered in GNU libiberty as distributed in GNU Binutils 2.32. It is a stack consumption issue in d_count_templates_scopes in cp-demangle.c after many recursive calls.

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In the GNU C Library (aka glibc or libc6) through 2.28 the getaddrinfo function would successfully parse a string that contained an IPv4 address followed by whitespace and arbitrary characters which could lead applications to incorrectly assume that it had parsed a valid string without the possibility of embedded HTTP headers or other potentially dangerous substrings.

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In the GNU C Library (aka glibc or libc6) through 2.28 attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

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The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example within a single execution of a program the output of every __builtin_darn() call may be the same.

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A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out. Directory paths containing an initial tilde followed by a valid username were affected by this issue. A local attacker could exploit this flaw by creating a specially crafted path that when processed by the glob function would potentially lead to arbitrary code execution. This was fixed in version 2.32.

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The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range reduction if an input to an 80-bit long double function contains a non-canonical bit pattern a seen when passing a 0x5d414141414141410000 value to sinl on x86 targets. This is related to sysdeps/ieee754/ldbl-96/e_rem_pio2l.c.

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do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-13638 but the ! syntax is specific to ed and is unrelated to a shell metacharacter.

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In GNU patch through 2.7.6 the following of symlinks is mishandled in certain cases other than input files. This affects inp.c and util.c.

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An issue was discovered in GNU libiberty as distributed in GNU Binutils 2.32. simple_object_elf_match in simple-object-elf.c does not check for a zero shstrndx value leading to an integer overflow and resultant heap-based buffer overflow.

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An issue was discovered in GNU patch through 2.7.6. There is a segmentation fault associated with a NULL pointer dereference leading to a denial of service in the intuit_diff_type function in pch.c aka a "mangled rename" issue.

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In the GNU C Library (aka glibc or libc6) through 2.29 proceed_next_node in posix/regexec.c has a heap-based buffer over-read via an attempted case-insensitive regular-expression match.

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An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default if Bash is run with its effective UID not equal to its real UID it will drop privileges by setting its effective UID to its real UID. However it does so incorrectly. On Linux and other systems that support "saved UID" functionality the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin which can be a shared object that calls setuid() and therefore regains privileges. However binaries running with an effective UID of 0 are unaffected.

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