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RUSTSEC-2021-0119: Out-of-bounds write in nix::unistd::getgrouplist

Out-of-bounds write in nix::unistd::getgrouplist

Details
Package nix
Version 0.18.0
URL nix-rust/nix#1541
Date 2021-09-27
Patched versions ^0.20.2,^0.21.2,^0.22.2,>=0.23.0
Unaffected versions <0.16.0

On certain platforms, if a user has more than 16 groups, the
nix::unistd::getgrouplist function will call the libc getgrouplist
function with a length parameter greater than the size of the buffer it
provides, resulting in an out-of-bounds write and memory corruption.

The libc getgrouplist function takes an in/out parameter ngroups
specifying the size of the group buffer. When the buffer is too small to
hold all of the reqested user's group memberships, some libc
implementations, including glibc and Solaris libc, will modify ngroups
to indicate the actual number of groups for the user, in addition to
returning an error. The version of nix::unistd::getgrouplist in nix
0.16.0 and up will resize the buffer to twice its size, but will not
read or modify the ngroups variable. Thus, if the user has more than
twice as many groups as the initial buffer size of 8, the next call to
getgrouplist will then write past the end of the buffer.

The issue would require editing /etc/groups to exploit, which is usually
only editable by the root user.

See advisory page for additional details.

RUSTSEC-2022-0048: xml-rs is Unmaintained

xml-rs is Unmaintained

Details
Status unmaintained
Package xml-rs
Version 0.8.4
URL https://github.com/netvl/xml-rs/issues
Date 2022-01-26

xml-rs is a XML parser has open issues around parsing including integer
overflows / panics that may or may not be an issue with untrusted data.

Together with these open issues with Unmaintained status xml-rs
may or may not be suited to parse untrusted data.

Alternatives

See advisory page for additional details.

RUSTSEC-2021-0070: VecStorage Deserialize Allows Violation of Length Invariant

VecStorage Deserialize Allows Violation of Length Invariant

Details
Package nalgebra
Version 0.26.2
URL dimforge/nalgebra#883
Date 2021-06-06
Patched versions >=0.27.1
Unaffected versions <0.11.0

The Deserialize implementation for VecStorage did not maintain the invariant that the number of elements must equal nrows * ncols. Deserialization of specially crafted inputs could allow memory access beyond allocation of the vector.

This flaw was introduced in v0.11.0 (086e6e) due to the addition of an automatically derived implementation of Deserialize for MatrixVec. MatrixVec was later renamed to VecStorage in v0.16.13 (0f66403) and continued to use the automatically derived implementation of Deserialize.

This flaw was corrected in commit 5bff536 by returning an error during deserialization if the number of elements does not exactly match the expected size.

See advisory page for additional details.

RUSTSEC-2021-0119: Out-of-bounds write in nix::unistd::getgrouplist

Out-of-bounds write in nix::unistd::getgrouplist

Details
Package nix
Version 0.20.0
URL nix-rust/nix#1541
Date 2021-09-27
Patched versions ^0.20.2,^0.21.2,^0.22.2,>=0.23.0
Unaffected versions <0.16.0

On certain platforms, if a user has more than 16 groups, the
nix::unistd::getgrouplist function will call the libc getgrouplist
function with a length parameter greater than the size of the buffer it
provides, resulting in an out-of-bounds write and memory corruption.

The libc getgrouplist function takes an in/out parameter ngroups
specifying the size of the group buffer. When the buffer is too small to
hold all of the reqested user's group memberships, some libc
implementations, including glibc and Solaris libc, will modify ngroups
to indicate the actual number of groups for the user, in addition to
returning an error. The version of nix::unistd::getgrouplist in nix
0.16.0 and up will resize the buffer to twice its size, but will not
read or modify the ngroups variable. Thus, if the user has more than
twice as many groups as the initial buffer size of 8, the next call to
getgrouplist will then write past the end of the buffer.

The issue would require editing /etc/groups to exploit, which is usually
only editable by the root user.

See advisory page for additional details.

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