Bug 2119550 (CVE-2020-26235)

Summary: CVE-2020-26235 rust-time: potential segmentation fault due to dangling pointer dereference
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: decathorpe, eclipseo, jistone, rust-sig
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Hardware: All   
OS: Linux   
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Bug Depends On: 2119559, 2119560, 2119561, 2119562    
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Description Guilherme de Almeida Suckevicz 2022-08-18 18:47:33 UTC 
In Rust time crate from version 0.2.7 and before version 0.2.23, unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires the user to set any environment variable in a different thread than the affected functions. The affected functions are time::UtcOffset::local_offset_at, time::UtcOffset::try_local_offset_at, time::UtcOffset::current_local_offset, time::UtcOffset::try_current_local_offset, time::OffsetDateTime::now_local and time::OffsetDateTime::try_now_local. Non-Unix targets are unaffected. This includes Windows and wasm. The issue was introduced in version 0.2.7 and fixed in version 0.2.23.

References:
https://github.com/time-rs/time/issues/293
https://github.com/time-rs/time/security/advisories/GHSA-wcg3-cvx6-7396
Comment 1 Guilherme de Almeida Suckevicz 2022-08-18 19:00:41 UTC 
Created rust-time-macros-impl tracking bugs for this issue:

Affects: fedora-all [bug 2119562]


Created rust-time-macros0.1 tracking bugs for this issue:

Affects: fedora-all [bug 2119561]


Created rust-time0.1 tracking bugs for this issue:

Affects: fedora-all [bug 2119559]


Created rust-timebomb tracking bugs for this issue:

Affects: fedora-all [bug 2119560]